11 files changed, 13495 insertions, 0 deletions
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/complete.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/complete.json
new file mode 100644
index 0000000..0aa14f4
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/complete.json
@@ -0,0 +1,5 @@
+{
+  "samples": 240,
+  "all_output_hashes_match": true,
+  "finished_utc": "2026-09-22T12:24:32Z"
+}
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/environment.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/environment.json
new file mode 100644
index 0000000..b2b8d87
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/environment.json
@@ -0,0 +1,57 @@
+{
+  "platform": "Linux-6.18.39+rpt-rpi-2712-aarch64-with-glibc2.41",
+  "machine": "aarch64",
+  "python": "3.14.7",
+  "cpu_affinity": 0,
+  "compiler": "cc (Debian 14.2.0-19) 14.2.0\nCopyright (C) 2024 Free Software Foundation, Inc.\nThis is free software; see the source for copying conditions.  There is NO\nwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n",
+  "builds": [
+    {
+      "command": [
+        "cc",
+        "-std=c17",
+        "-Wall",
+        "-Wextra",
+        "-Wpedantic",
+        "-Werror",
+        "-O2",
+        "-g",
+        "/home/eunhhu/work/pure/research/experiments/002-buffer-retention/benchmark.c",
+        "-o",
+        "/tmp/pure-retention-ktukd04y/bench"
+      ],
+      "stderr": "",
+      "sha256": "61e0dcf961714992da8d8f2846a09caeda95ce1ac183e2b82dbb80828c6ae43c",
+      "size_bytes": 101072
+    },
+    {
+      "command": [
+        "cc",
+        "-std=c17",
+        "-Wall",
+        "-Wextra",
+        "-Wpedantic",
+        "-Werror",
+        "-O2",
+        "-g",
+        "-fsanitize=address,undefined",
+        "-fno-omit-frame-pointer",
+        "/home/eunhhu/work/pure/research/experiments/002-buffer-retention/benchmark.c",
+        "-o",
+        "/tmp/pure-retention-ktukd04y/bench-sanitized"
+      ],
+      "stderr": "",
+      "sha256": "a4a383b9a31ec0d3cd2ac60a1697d863f0424a303608c69ed6faff969dd5d6de",
+      "size_bytes": 257680
+    }
+  ],
+  "source_sha256": {
+    "benchmark.c": "8ac37467fd01421f23924d0e92c890cc161dbd7b3d55642ce91d47e8f12a1e52",
+    "run.py": "f40df6109d1270afa3a3241b4d22c6842d3dbf360ccf3f563ec067df5f9b1fb3",
+    "plan.json": "0e07742173d3a415af1791e2d92b3ce9319152c3bca8dfbe6e3cd8de6e13a9f4"
+  },
+  "clock": "CLOCK_MONOTONIC; CPU = CLOCK_PROCESS_CPUTIME_ID",
+  "timing": "includes file IO, scheduling, deliberate sleep, metrics, buffer cleanup; excludes startup/build/fixture/verification",
+  "limitations": "shared host; unregulated thermals; cached files; output page cache, no fsync; synthetic closed-loop arrivals",
+  "started_utc": "2026-09-22T12:23:38Z",
+  "cpuinfo": "processor\t: 0\nBogoMIPS\t: 108.00\nFeatures\t: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp\nCPU implementer\t: 0x41\nCPU architecture: 8\nCPU variant\t: 0x4\nCPU part\t: 0xd0b\nCPU revision\t: 1\n\nprocessor\t: 1\nBogoMIPS\t: 108.00\nFeatures\t: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp\nCPU implementer\t: 0x41\nCPU architecture: 8\nCPU variant\t: 0x4\nCPU part\t: 0xd0b\nCPU revision\t: 1\n\nprocessor\t: 2\nBogoMIPS\t: 108.00\nFeatures\t: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp\nCPU implementer\t: 0x41\nCPU architecture: 8\nCPU variant\t: 0x4\nCPU part\t: 0xd0b\nCPU revision\t: 1\n\nprocessor\t: 3\nBogoMIPS\t: 108.00\nFeatures\t: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp\nCPU implementer\t: 0x41\nCPU architecture: 8\nCPU variant\t: 0x4\nCPU part\t: 0xd0b\nCPU revision\t: 1\n\nRevision\t: d04171\nSerial\t\t: d3ba8e625dbe42ac\nModel\t\t: Raspberry Pi 5 Model B Rev 1.1\n"
+}
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/fixtures.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/fixtures.json
new file mode 100644
index 0000000..2fe2bb6
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/fixtures.json
@@ -0,0 +1,68 @@
+[
+  {
+    "path": "input.frames",
+    "shape": "sparse",
+    "records": 2048,
+    "seed": 20260922,
+    "input_bytes": 134242304,
+    "input_sha256": "161377ac76f4b7d35b13db7edf3b93bb279ddd83f6514051020e8b49e743d1c0",
+    "expected_output_bytes": 139264,
+    "expected_output_sha256": "a01c7bff45f73512f3bc0dbd02d7c3a1f4ceb09f574d7c25b926cd3d30bb1bfa",
+    "case": "sparse_slow"
+  },
+  {
+    "path": "input.frames",
+    "shape": "sparse",
+    "records": 2048,
+    "seed": 20260922,
+    "input_bytes": 134242304,
+    "input_sha256": "161377ac76f4b7d35b13db7edf3b93bb279ddd83f6514051020e8b49e743d1c0",
+    "expected_output_bytes": 139264,
+    "expected_output_sha256": "a01c7bff45f73512f3bc0dbd02d7c3a1f4ceb09f574d7c25b926cd3d30bb1bfa",
+    "case": "sparse_slots64"
+  },
+  {
+    "path": "input.frames",
+    "shape": "dense",
+    "records": 2048,
+    "seed": 20260922,
+    "input_bytes": 134242304,
+    "input_sha256": "fb28c2da0af227079bd6888c3f549fa5a48abd0b790c3939dc330111e80c0b7f",
+    "expected_output_bytes": 100671488,
+    "expected_output_sha256": "d96dd7f80d696895e66521630fd30f13adabf63bea3b84b0a709fbc8c4095aa5",
+    "case": "dense_slow"
+  },
+  {
+    "path": "input.frames",
+    "shape": "mixed",
+    "records": 2048,
+    "seed": 20260922,
+    "input_bytes": 177631232,
+    "input_sha256": "5cfcb8e74d5f30c3a611f373ddf53fd5bc843841d83de42c763e1d931403521d",
+    "expected_output_bytes": 53735632,
+    "expected_output_sha256": "f6b4eb83e7ca9aa4b5b2e0675d34b656815c82c992700ee9cbd7e0a15594cb0b",
+    "case": "mixed_slow"
+  },
+  {
+    "path": "input.frames",
+    "shape": "mixed",
+    "records": 2048,
+    "seed": 20260922,
+    "input_bytes": 177631232,
+    "input_sha256": "5cfcb8e74d5f30c3a611f373ddf53fd5bc843841d83de42c763e1d931403521d",
+    "expected_output_bytes": 53735632,
+    "expected_output_sha256": "f6b4eb83e7ca9aa4b5b2e0675d34b656815c82c992700ee9cbd7e0a15594cb0b",
+    "case": "mixed_tight"
+  },
+  {
+    "path": "input.frames",
+    "shape": "sparse",
+    "records": 2048,
+    "seed": 20260922,
+    "input_bytes": 134242304,
+    "input_sha256": "161377ac76f4b7d35b13db7edf3b93bb279ddd83f6514051020e8b49e743d1c0",
+    "expected_output_bytes": 139264,
+    "expected_output_sha256": "a01c7bff45f73512f3bc0dbd02d7c3a1f4ceb09f574d7c25b926cd3d30bb1bfa",
+    "case": "sparse_fast"
+  }
+]
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/plan.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/plan.json
new file mode 100644
index 0000000..23db315
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/plan.json
@@ -0,0 +1,113 @@
+{
+  "version": 2,
+  "written_before_measurement": true,
+  "revision_note": "The v1 run is preserved. Before this v2 run, RSS instrumentation was corrected and a 64-slot sparse sensitivity case was added after observing different queue occupancy. This is an exploratory follow-up, not a pre-registered confirmation.",
+  "seed": 20260922,
+  "repeats": 5,
+  "slots": 512,
+  "policies": [
+    {
+      "name": "borrow",
+      "policy": "borrow",
+      "pool": 1
+    },
+    {
+      "name": "copy",
+      "policy": "copy",
+      "pool": 1
+    },
+    {
+      "name": "threshold2",
+      "policy": "threshold",
+      "ratio": 2,
+      "pool": 1
+    },
+    {
+      "name": "threshold4",
+      "policy": "threshold",
+      "ratio": 4,
+      "pool": 1
+    },
+    {
+      "name": "threshold8",
+      "policy": "threshold",
+      "ratio": 8,
+      "pool": 1
+    },
+    {
+      "name": "pressure",
+      "policy": "pressure",
+      "pool": 1
+    },
+    {
+      "name": "project",
+      "policy": "project",
+      "pool": 1
+    },
+    {
+      "name": "copy_no_pool",
+      "policy": "copy",
+      "pool": 0
+    }
+  ],
+  "cases": [
+    {
+      "name": "sparse_slow",
+      "shape": "sparse",
+      "records": 2048,
+      "budget": 8388608,
+      "hold_us": 5000,
+      "service_us": 20
+    },
+    {
+      "name": "sparse_slots64",
+      "shape": "sparse",
+      "records": 2048,
+      "budget": 8388608,
+      "slots": 64,
+      "hold_us": 5000,
+      "service_us": 20
+    },
+    {
+      "name": "dense_slow",
+      "shape": "dense",
+      "records": 2048,
+      "budget": 8388608,
+      "hold_us": 5000,
+      "service_us": 20
+    },
+    {
+      "name": "mixed_slow",
+      "shape": "mixed",
+      "records": 2048,
+      "budget": 8388608,
+      "hold_us": 5000,
+      "service_us": 20
+    },
+    {
+      "name": "mixed_tight",
+      "shape": "mixed",
+      "records": 2048,
+      "budget": 2097152,
+      "hold_us": 5000,
+      "service_us": 20
+    },
+    {
+      "name": "sparse_fast",
+      "shape": "sparse",
+      "records": 2048,
+      "budget": 8388608,
+      "hold_us": 0,
+      "service_us": 0
+    }
+  ],
+  "expectations": [
+    "Borrow retains full source allocations for small selections.",
+    "Copy can add CPU and transient source plus destination memory for dense selections.",
+    "A current-pressure rule need not outperform a static size rule or early projection.",
+    "Pool reuse can reduce allocation calls while increasing reserved idle memory.",
+    "No Pure-specific advantage, application SLO, or statistical significance is presumed."
+  ],
+  "comparison_rule": "Report all presets and repetitions; no post-hoc winner is called an out-of-sample tuned policy.",
+  "limits": "Single FIFO local pipeline with synthetic delayed sink. No Sonic/Node/.NET benchmark, fan-out, persistent cache, generic JSON parser, external open-loop arrivals, or production SLO."
+}
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/raw.csv b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/raw.csv
new file mode 100644
index 0000000..b9160ae
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/raw.csv
@@ -0,0 +1,241 @@
+case,variant,repeat,status,policy,pool,budget_bytes,fixed_bytes,peak_reserved_bytes,peak_active_bytes,peak_queue,rss_peak_bytes,rusage_maxrss_bytes,rss_peak_source,elapsed_ns,cpu_ns,input_bytes,output_bytes,accepted,emitted,copy_bytes,copied_records,borrowed_records,pressure_copies,allocations,reuses,budget_waits,slot_waits,sleep_ns,latency_mean_ns,latency_p99_upper_ns,latency_max_ns,active_byte_seconds,live_at_stop_bytes,cached_at_stop_bytes,unreleased_buffer_bytes
+sparse_slow,copy,0,ok,copy,True,8388608,90560,197072,197072,512,1687552,27246592,linux_proc_vmhwm_approximate,160143537,26459012,134242304,139264,2048,2048,131072,2048,0,0,513,3583,0,1524,137390253,34696998.27,41943040,41171715,6863.022101,0,66752,0
+sparse_slow,threshold4,0,ok,threshold,True,8388608,90560,197072,197072,512,1703936,27246592,linux_proc_vmhwm_approximate,157308101,31229598,134242304,139264,2048,2048,131072,2048,0,0,513,3583,0,1480,130450222,33900498.29,41943040,39440182,6941.796558,0,66752,0
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+sparse_slow,copy_no_pool,0,ok,copy,False,8388608,90560,197072,197072,512,1703936,27246592,linux_proc_vmhwm_approximate,155097886,24003453,134242304,139264,2048,2048,131072,2048,0,0,4096,0,0,1537,135038766,33344720.225,41943040,38228742,6474.089644,0,0,0
+sparse_slow,project,0,ok,project,True,8388608,90560,131520,131520,512,1654784,27246592,linux_proc_vmhwm_approximate,154147870,24607892,134242304,139264,2048,2048,0,0,0,0,512,1536,0,1536,133284576,33266783.578,37748736,37610633,5450.353596,0,1280,0
+sparse_slow,threshold8,0,ok,threshold,True,8388608,90560,197072,197072,512,1703936,27246592,linux_proc_vmhwm_approximate,159785538,24425471,134242304,139264,2048,2048,131072,2048,0,0,513,3583,0,1534,139188295,34401146.148,41943040,40673920,6694.694537,0,66752,0
+sparse_slow,borrow,0,ok,borrow,True,8388608,90560,8350112,8350112,126,9486336,27246592,linux_proc_vmhwm_approximate,107974911,48356230,134242304,139264,2048,2048,0,0,2048,0,126,1922,1100,0,61689899,6299431.416,9437184,9257676,842052.147088,0,1048832,0
+sparse_slow,pressure,0,ok,pressure,True,8388608,90560,4321888,4318208,512,5832704,27246592,linux_proc_vmhwm_approximate,153730223,27269441,134242304,139264,2048,2048,113984,1781,267,1781,514,3315,0,1480,130232809,32945208.971,41943040,38336797,525465.223488,0,590528,0
+sparse_slow,borrow,1,ok,borrow,True,8388608,90560,8350112,8350112,126,9469952,27246592,linux_proc_vmhwm_approximate,106374934,48221069,134242304,139264,2048,2048,0,0,2048,0,126,1922,1095,0,60129493,6201710.718,9437184,9283991,829040.966005,0,1048832,0
+sparse_slow,copy_no_pool,1,ok,copy,False,8388608,90560,197072,197072,512,1687552,27246592,linux_proc_vmhwm_approximate,160320037,25896167,134242304,139264,2048,2048,131072,2048,0,0,4096,0,0,1525,138363559,34524425.147,41943040,40334217,6779.619735,0,0,0
+sparse_slow,threshold2,1,ok,threshold,True,8388608,90560,197072,197072,512,1703936,27246592,linux_proc_vmhwm_approximate,160914091,25835642,134242304,139264,2048,2048,131072,2048,0,0,513,3583,0,1519,138817024,34925615.31,46137344,42672599,6869.973543,0,66752,0
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diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/raw.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/raw.json
new file mode 100644
index 0000000..6fc0da0
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/raw.json
@@ -0,0 +1,9122 @@
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+    "repeat": 4,
+    "status": "ok",
+    "policy": "threshold",
+    "pool": true,
+    "budget_bytes": 8388608,
+    "fixed_bytes": 90560,
+    "peak_reserved_bytes": 156192,
+    "peak_active_bytes": 156192,
+    "peak_queue": 1,
+    "rss_peak_bytes": 1605632,
+    "rusage_maxrss_bytes": 27246592,
+    "rss_peak_source": "linux_proc_vmhwm_approximate",
+    "elapsed_ns": 21989119,
+    "cpu_ns": 21857259,
+    "input_bytes": 134242304,
+    "output_bytes": 139264,
+    "accepted": 2048,
+    "emitted": 2048,
+    "copy_bytes": 131072,
+    "copied_records": 2048,
+    "borrowed_records": 0,
+    "pressure_copies": 0,
+    "allocations": 2,
+    "reuses": 4094,
+    "budget_waits": 0,
+    "slot_waits": 0,
+    "sleep_ns": 0,
+    "latency_mean_ns": 10590.063,
+    "latency_p99_upper_ns": 18432,
+    "latency_max_ns": 79983,
+    "active_byte_seconds": 1185.989886,
+    "live_at_stop_bytes": 0,
+    "cached_at_stop_bytes": 65632,
+    "unreleased_buffer_bytes": 0
+  },
+  {
+    "case": "sparse_fast",
+    "variant": "copy_no_pool",
+    "repeat": 4,
+    "status": "ok",
+    "policy": "copy",
+    "pool": false,
+    "budget_bytes": 8388608,
+    "fixed_bytes": 90560,
+    "peak_reserved_bytes": 156192,
+    "peak_active_bytes": 156192,
+    "peak_queue": 1,
+    "rss_peak_bytes": 1605632,
+    "rusage_maxrss_bytes": 27246592,
+    "rss_peak_source": "linux_proc_vmhwm_approximate",
+    "elapsed_ns": 21265947,
+    "cpu_ns": 21072353,
+    "input_bytes": 134242304,
+    "output_bytes": 139264,
+    "accepted": 2048,
+    "emitted": 2048,
+    "copy_bytes": 131072,
+    "copied_records": 2048,
+    "borrowed_records": 0,
+    "pressure_copies": 0,
+    "allocations": 4096,
+    "reuses": 0,
+    "budget_waits": 0,
+    "slot_waits": 0,
+    "sleep_ns": 0,
+    "latency_mean_ns": 10215.53,
+    "latency_p99_upper_ns": 16384,
+    "latency_max_ns": 91668,
+    "active_byte_seconds": 1125.003597,
+    "live_at_stop_bytes": 0,
+    "cached_at_stop_bytes": 0,
+    "unreleased_buffer_bytes": 0
+  },
+  {
+    "case": "sparse_fast",
+    "variant": "project",
+    "repeat": 4,
+    "status": "ok",
+    "policy": "project",
+    "pool": true,
+    "budget_bytes": 8388608,
+    "fixed_bytes": 90560,
+    "peak_reserved_bytes": 90640,
+    "peak_active_bytes": 90640,
+    "peak_queue": 1,
+    "rss_peak_bytes": 1507328,
+    "rusage_maxrss_bytes": 27246592,
+    "rss_peak_source": "linux_proc_vmhwm_approximate",
+    "elapsed_ns": 21358726,
+    "cpu_ns": 21358833,
+    "input_bytes": 134242304,
+    "output_bytes": 139264,
+    "accepted": 2048,
+    "emitted": 2048,
+    "copy_bytes": 0,
+    "copied_records": 0,
+    "borrowed_records": 0,
+    "pressure_copies": 0,
+    "allocations": 1,
+    "reuses": 2047,
+    "budget_waits": 0,
+    "slot_waits": 0,
+    "sleep_ns": 0,
+    "latency_mean_ns": 10284.012,
+    "latency_p99_upper_ns": 13312,
+    "latency_max_ns": 47648,
+    "active_byte_seconds": 1.620534,
+    "live_at_stop_bytes": 0,
+    "cached_at_stop_bytes": 80,
+    "unreleased_buffer_bytes": 0
+  },
+  {
+    "case": "sparse_fast",
+    "variant": "threshold8",
+    "repeat": 4,
+    "status": "ok",
+    "policy": "threshold",
+    "pool": true,
+    "budget_bytes": 8388608,
+    "fixed_bytes": 90560,
+    "peak_reserved_bytes": 156192,
+    "peak_active_bytes": 156192,
+    "peak_queue": 1,
+    "rss_peak_bytes": 1572864,
+    "rusage_maxrss_bytes": 27246592,
+    "rss_peak_source": "linux_proc_vmhwm_approximate",
+    "elapsed_ns": 20441422,
+    "cpu_ns": 20426148,
+    "input_bytes": 134242304,
+    "output_bytes": 139264,
+    "accepted": 2048,
+    "emitted": 2048,
+    "copy_bytes": 131072,
+    "copied_records": 2048,
+    "borrowed_records": 0,
+    "pressure_copies": 0,
+    "allocations": 2,
+    "reuses": 4094,
+    "budget_waits": 0,
+    "slot_waits": 0,
+    "sleep_ns": 0,
+    "latency_mean_ns": 9835.821,
+    "latency_p99_upper_ns": 13312,
+    "latency_max_ns": 50945,
+    "active_byte_seconds": 1089.704272,
+    "live_at_stop_bytes": 0,
+    "cached_at_stop_bytes": 65632,
+    "unreleased_buffer_bytes": 0
+  },
+  {
+    "case": "sparse_fast",
+    "variant": "copy",
+    "repeat": 4,
+    "status": "ok",
+    "policy": "copy",
+    "pool": true,
+    "budget_bytes": 8388608,
+    "fixed_bytes": 90560,
+    "peak_reserved_bytes": 156192,
+    "peak_active_bytes": 156192,
+    "peak_queue": 1,
+    "rss_peak_bytes": 1605632,
+    "rusage_maxrss_bytes": 27246592,
+    "rss_peak_source": "linux_proc_vmhwm_approximate",
+    "elapsed_ns": 20717721,
+    "cpu_ns": 20717834,
+    "input_bytes": 134242304,
+    "output_bytes": 139264,
+    "accepted": 2048,
+    "emitted": 2048,
+    "copy_bytes": 131072,
+    "copied_records": 2048,
+    "borrowed_records": 0,
+    "pressure_copies": 0,
+    "allocations": 2,
+    "reuses": 4094,
+    "budget_waits": 0,
+    "slot_waits": 0,
+    "sleep_ns": 0,
+    "latency_mean_ns": 9969.584,
+    "latency_p99_upper_ns": 13312,
+    "latency_max_ns": 40148,
+    "active_byte_seconds": 1106.215747,
+    "live_at_stop_bytes": 0,
+    "cached_at_stop_bytes": 65632,
+    "unreleased_buffer_bytes": 0
+  },
+  {
+    "case": "sparse_fast",
+    "variant": "threshold4",
+    "repeat": 4,
+    "status": "ok",
+    "policy": "threshold",
+    "pool": true,
+    "budget_bytes": 8388608,
+    "fixed_bytes": 90560,
+    "peak_reserved_bytes": 156192,
+    "peak_active_bytes": 156192,
+    "peak_queue": 1,
+    "rss_peak_bytes": 1605632,
+    "rusage_maxrss_bytes": 27246592,
+    "rss_peak_source": "linux_proc_vmhwm_approximate",
+    "elapsed_ns": 20693813,
+    "cpu_ns": 20694148,
+    "input_bytes": 134242304,
+    "output_bytes": 139264,
+    "accepted": 2048,
+    "emitted": 2048,
+    "copy_bytes": 131072,
+    "copied_records": 2048,
+    "borrowed_records": 0,
+    "pressure_copies": 0,
+    "allocations": 2,
+    "reuses": 4094,
+    "budget_waits": 0,
+    "slot_waits": 0,
+    "sleep_ns": 0,
+    "latency_mean_ns": 9958.775,
+    "latency_p99_upper_ns": 13312,
+    "latency_max_ns": 66019,
+    "active_byte_seconds": 1106.254829,
+    "live_at_stop_bytes": 0,
+    "cached_at_stop_bytes": 65632,
+    "unreleased_buffer_bytes": 0
+  }
+]
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/benchmark.c b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/benchmark.c
new file mode 100644
index 0000000..c9e8120
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/benchmark.c
@@ -0,0 +1,338 @@
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <time.h>
+#include <unistd.h>
+
+/* A measurement apparatus, not the Pure runtime or a general document parser. */
+enum { CACHE_SLOTS = 16, SCRATCH = 65536, HIST_SIZE = 512, MAX_FRAME = 8*1024*1024 };
+typedef struct Block { size_t capacity; uint64_t since; unsigned char bytes[]; } Block;
+typedef struct Item {
+    Block *block;
+    size_t offset, length;
+    uint64_t start, ready;
+} Item;
+typedef struct Engine {
+    Item *queue;
+    Block *cache[CACHE_SLOTS];
+    unsigned char scratch[SCRATCH];
+    uint64_t histogram[HIST_SIZE];
+    size_t slots, head, count, fixed, budget, reserved, active, cached;
+    size_t peak_reserved, peak_active, peak_queue;
+    uint64_t allocations, reuses, copies, read_bytes, written_bytes;
+    uint64_t accepted, emitted, copied_records, borrowed_records, pressure_copies;
+    uint64_t budget_waits, slot_waits, sleep_ns, hold_ns, service_ns, last_emit;
+    uint64_t elapsed_ns, cpu_ns, latency_sum, latency_max, start, cancel_after;
+    long double active_byte_ns;
+    unsigned ratio;
+    bool pool;
+    const char *policy, *status;
+} Engine;
+static volatile sig_atomic_t interrupted;
+static void stop(int sig) { (void)sig; interrupted = 1; }
+static uint64_t ns(clockid_t clock) {
+    struct timespec t;
+    if (clock_gettime(clock, &t)) { perror("clock_gettime"); exit(2); }
+    return (uint64_t)t.tv_sec * UINT64_C(1000000000) + (uint64_t)t.tv_nsec;
+}
+static size_t charge(const Block *b) { return sizeof(*b) + b->capacity; }
+static size_t rounded(size_t n) {
+    size_t r = 64;
+    while (r < n) r *= 2;
+    return r;
+}
+static void peaks(Engine *e) {
+    assert(e->active + e->cached == e->reserved);
+    assert(e->fixed + e->reserved <= e->budget);
+    if (e->reserved > e->peak_reserved) e->peak_reserved = e->reserved;
+    if (e->active > e->peak_active) e->peak_active = e->active;
+}
+static void evict(Engine *e, size_t i) {
+    Block *b = e->cache[i];
+    if (!b) return;
+    e->cached -= charge(b); e->reserved -= charge(b);
+    free(b); e->cache[i] = NULL;
+}
+static Block *take(Engine *e, size_t n) {
+    size_t capacity = rounded(n), need = sizeof(Block) + capacity;
+    if (e->pool) {
+        for (size_t i = 0; i < CACHE_SLOTS; ++i) {
+            Block *b = e->cache[i];
+            if (b && b->capacity == capacity) {
+                e->cache[i] = NULL; e->cached -= need; e->active += need;
+                ++e->reuses; b->since = ns(CLOCK_MONOTONIC); peaks(e); return b;
+            }
+        }
+    }
+    for (size_t i = 0; i < CACHE_SLOTS && need > e->budget-e->fixed-e->reserved; ++i)
+        evict(e, i);
+    if (need > e->budget-e->fixed-e->reserved) return NULL;
+    Block *b = malloc(need);
+    if (!b) { e->status = "allocation_failed"; return NULL; }
+    b->capacity = capacity; b->since = ns(CLOCK_MONOTONIC);
+    e->reserved += need; e->active += need; ++e->allocations; peaks(e); return b;
+}
+static void give(Engine *e, Block *b) {
+    if (!b) return;
+    size_t bytes = charge(b);
+    e->active_byte_ns += (long double)bytes * (ns(CLOCK_MONOTONIC)-b->since);
+    e->active -= bytes;
+    if (e->pool && bytes <= e->budget/4-e->cached) {
+        for (size_t i = 0; i < CACHE_SLOTS; ++i) if (!e->cache[i]) {
+            e->cache[i] = b; e->cached += bytes; peaks(e); return;
+        }
+    }
+    e->reserved -= bytes; free(b); peaks(e);
+}
+static bool sleep_until(Engine *e, uint64_t deadline) {
+    uint64_t t = ns(CLOCK_MONOTONIC), start = t;
+    while (t < deadline && !interrupted) {
+        uint64_t delta = deadline-t;
+        struct timespec request = {(time_t)(delta/1000000000), (long)(delta%1000000000)};
+        if (nanosleep(&request, NULL) && errno != EINTR) { e->status="sleep_failed"; return false; }
+        t = ns(CLOCK_MONOTONIC);
+    }
+    e->sleep_ns += t-start;
+    return !interrupted;
+}
+/* floor(log2(ns)) with eight subdivisions: upper bound error <= 12.5%. */
+static unsigned bucket(uint64_t n) {
+    unsigned exponent = 0;
+    for (uint64_t x = n; x > 1; x >>= 1) ++exponent;
+    if (exponent < 3) return (unsigned)n;
+    return exponent*8 + (unsigned)((n-(UINT64_C(1)<<exponent))>>(exponent-3));
+}
+static uint64_t upper(unsigned b) {
+    if (b < 24) return b+1;
+    unsigned exponent = b/8;
+    if (exponent >= 63) return UINT64_MAX;
+    return (UINT64_C(1)<<exponent) + (uint64_t)(b%8+1)*(UINT64_C(1)<<(exponent-3));
+}
+static bool write_all(Engine *e, const void *src, size_t n) {
+    const unsigned char *p = src;
+    while (n && !interrupted) {
+        ssize_t written = write(STDOUT_FILENO, p, n);
+        if (written < 0 && errno == EINTR) continue;
+        if (written <= 0) { e->status = "output_failed"; return false; }
+        p += written; n -= (size_t)written; e->written_bytes += (uint64_t)written;
+    }
+    return !interrupted;
+}
+static bool emit(Engine *e) {
+    assert(e->count);
+    Item *item = &e->queue[e->head];
+    uint64_t ready = item->ready;
+    if (e->last_emit + e->service_ns > ready) ready = e->last_emit + e->service_ns;
+    if (!sleep_until(e, ready)) return false;
+    uint32_t len = (uint32_t)item->length;
+    unsigned char header[4] = {(unsigned char)len, (unsigned char)(len>>8),
+                              (unsigned char)(len>>16), (unsigned char)(len>>24)};
+    if (!write_all(e, header, sizeof header) ||
+        !write_all(e, item->block->bytes+item->offset, item->length)) return false;
+    uint64_t now = ns(CLOCK_MONOTONIC), latency = now-item->start;
+    ++e->histogram[bucket(latency)]; e->latency_sum += latency;
+    if (latency > e->latency_max) e->latency_max = latency;
+    e->last_emit = now; ++e->emitted;
+    give(e, item->block); item->block = NULL;
+    e->head = (e->head+1)%e->slots; --e->count;
+    if (e->cancel_after && e->emitted >= e->cancel_after) {
+        e->status = "cancelled"; return false;
+    }
+    return true;
+}
+static Block *acquire(Engine *e, size_t n) {
+    for (;;) {
+        Block *b = take(e, n);
+        if (b) return b;
+        if (strcmp(e->status, "ok")) return NULL;
+        if (!e->count) { e->status = "budget_too_small"; return NULL; }
+        ++e->budget_waits;
+        if (!emit(e)) return NULL;
+    }
+}
+/* Returns 1 on complete read, 0 on clean EOF before any byte, -1 on failure. */
+static int read_exact(Engine *e, void *dst, size_t n) {
+    unsigned char *p = dst; size_t done = 0;
+    while (done < n && !interrupted) {
+        ssize_t got = read(STDIN_FILENO, p+done, n-done);
+        if (got < 0 && errno == EINTR) continue;
+        if (got < 0) { e->status="input_failed"; return -1; }
+        if (!got) { if (!done) return 0; e->status="truncated_input"; return -1; }
+        done += (size_t)got; e->read_bytes += (uint64_t)got;
+    }
+    return interrupted ? -1 : 1;
+}
+static bool discard(Engine *e, size_t n) {
+    while (n) {
+        size_t chunk = n < SCRATCH ? n : SCRATCH;
+        if (read_exact(e, e->scratch, chunk) != 1) {
+            if (!strcmp(e->status,"ok")) e->status="truncated_input";
+            return false;
+        }
+        n -= chunk;
+    }
+    return true;
+}
+static uint32_t le32(const unsigned char *p) {
+    return (uint32_t)p[0] | (uint32_t)p[1]<<8 | (uint32_t)p[2]<<16 | (uint32_t)p[3]<<24;
+}
+/* Linux's rusage high-water mark survives exec. Read the current mm's HWM
+ * separately; proc RSS accounting is approximate, not allocator accounting. */
+static uint64_t image_peak_rss(void) {
+#if defined(__linux__)
+    FILE *status = fopen("/proc/self/status", "r");
+    if (!status) return 0;
+    char line[256]; unsigned long long kib = 0;
+    while (fgets(line, sizeof line, status))
+        if (sscanf(line, "VmHWM: %llu kB", &kib) == 1) break;
+    fclose(status);
+    return (uint64_t)kib * 1024;
+#else
+    return 0; /* No current-image peak implemented for other OSes. */
+#endif
+}
+static void run(Engine *e) {
+    for (;;) {
+        if (interrupted) break;
+        if (e->count) {
+            Item *head = &e->queue[e->head];
+            uint64_t now = ns(CLOCK_MONOTONIC);
+            if (now >= head->ready && now >= e->last_emit+e->service_ns) {
+                if (!emit(e)) break;
+                continue;
+            }
+        }
+        if (e->count == e->slots) { ++e->slot_waits; if (!emit(e)) break; }
+        unsigned char header[12];
+        uint64_t start = ns(CLOCK_MONOTONIC);
+        int got = read_exact(e, header, sizeof header);
+        if (got != 1) {
+            if (!got) while (e->count && !interrupted) if (!emit(e)) break;
+            break;
+        }
+        size_t payload = le32(header), offset = le32(header+4), length = le32(header+8);
+        if (!payload || payload > MAX_FRAME || !length || offset > payload || length > payload-offset) {
+            e->status="invalid_frame"; break;
+        }
+        bool project = !strcmp(e->policy,"project");
+        Block *source = acquire(e, project ? length : payload);
+        if (!source) break;
+        bool valid;
+        if (project) {
+            valid = discard(e, offset) && read_exact(e, source->bytes, length)==1 &&
+                    discard(e, payload-offset-length);
+            offset = 0;
+        } else valid = read_exact(e, source->bytes, payload)==1;
+        if (!valid) {
+            if (!strcmp(e->status,"ok")) e->status="truncated_input";
+            give(e, source); break;
+        }
+        bool copy = !strcmp(e->policy,"copy") ||
+            (!strcmp(e->policy,"threshold") && rounded(payload)/rounded(length) >= e->ratio);
+        if (!strcmp(e->policy,"pressure")) {
+            /* Online rule using current charged live buffers; no future lifetime. */
+            copy = rounded(length) < source->capacity &&
+                   e->active > (e->budget-e->fixed)/2;
+            if (copy) ++e->pressure_copies;
+        }
+        if (!project && copy) {
+            Block *small = acquire(e, length);
+            if (!small) { give(e, source); break; }
+            memcpy(small->bytes, source->bytes+offset, length);
+            e->copies += length; ++e->copied_records;
+            give(e, source); source = small; offset = 0;
+        } else if (!project) ++e->borrowed_records;
+        size_t tail = (e->head+e->count)%e->slots;
+        e->queue[tail] = (Item){source, offset, length, start, ns(CLOCK_MONOTONIC)+e->hold_ns};
+        ++e->count; ++e->accepted;
+        if (e->count > e->peak_queue) e->peak_queue=e->count;
+    }
+    if (interrupted) e->status="cancelled";
+}
+static uint64_t number(const char *s, uint64_t maximum) {
+    char *end; errno=0;
+    unsigned long long n = strtoull(s, &end, 10);
+    if (!*s || *s=='-' || *end || errno || n>maximum) { fprintf(stderr,"invalid number\n"); exit(2); }
+    return n;
+}
+int main(int argc, char **argv) {
+    Engine *e = calloc(1, sizeof *e);
+    if (!e) return 2;
+    e->policy="borrow"; e->status="ok"; e->budget=8*1024*1024; e->slots=512;
+    e->ratio=4; e->pool=true;
+    for (int i=1; i<argc; i+=2) {
+        if (i+1==argc) { fprintf(stderr,"options require values\n"); free(e); return 2; }
+        const char *key=argv[i], *value=argv[i+1];
+        if (!strcmp(key,"--policy")) e->policy=value;
+        else if (!strcmp(key,"--budget")) e->budget=(size_t)number(value,1073741824);
+        else if (!strcmp(key,"--slots")) e->slots=(size_t)number(value,4096);
+        else if (!strcmp(key,"--hold-us")) e->hold_ns=number(value,10000000)*1000;
+        else if (!strcmp(key,"--service-us")) e->service_ns=number(value,10000000)*1000;
+        else if (!strcmp(key,"--ratio")) e->ratio=(unsigned)number(value,UINT_MAX);
+        else if (!strcmp(key,"--pool")) e->pool=number(value,1)!=0;
+        else if (!strcmp(key,"--cancel-after")) e->cancel_after=number(value,UINT64_MAX);
+        else { fprintf(stderr,"unknown option\n"); free(e); return 2; }
+    }
+    bool known = !strcmp(e->policy,"borrow") || !strcmp(e->policy,"copy") ||
+        !strcmp(e->policy,"threshold") || !strcmp(e->policy,"pressure") || !strcmp(e->policy,"project");
+    if (!known || !e->slots || e->slots>4096 || e->ratio<2 || e->budget>UINT64_C(1073741824) ||
+        e->hold_ns>UINT64_C(10000000000) || e->service_ns>UINT64_C(10000000000)) {
+        fprintf(stderr,"invalid configuration\n"); free(e); return 2;
+    }
+    e->fixed=sizeof(*e)+e->slots*sizeof(Item);
+    if (e->budget < e->fixed) { fprintf(stderr,"budget below fixed metadata\n"); free(e); return 2; }
+    e->queue=calloc(e->slots,sizeof(Item));
+    if (!e->queue) { free(e); return 2; }
+    signal(SIGINT,stop); signal(SIGTERM,stop); signal(SIGPIPE,SIG_IGN);
+    e->start=ns(CLOCK_MONOTONIC); uint64_t cpu=ns(CLOCK_PROCESS_CPUTIME_ID);
+    run(e);
+    size_t live_at_stop=e->active, cached_at_stop=e->cached;
+    while (e->count) {
+        give(e,e->queue[e->head].block); e->head=(e->head+1)%e->slots; --e->count;
+    }
+    for (size_t i=0;i<CACHE_SLOTS;++i) evict(e,i);
+    assert(!e->active && !e->reserved && !e->cached);
+    e->elapsed_ns=ns(CLOCK_MONOTONIC)-e->start; e->cpu_ns=ns(CLOCK_PROCESS_CPUTIME_ID)-cpu;
+    uint64_t target=e->emitted-e->emitted/100, sum=0, p99=0;
+    for (unsigned b=0; e->emitted && b<HIST_SIZE; ++b) {
+        sum+=e->histogram[b]; if (sum>=target) { p99=upper(b); break; }
+    }
+    struct rusage usage; long rss=0;
+    if (!getrusage(RUSAGE_SELF,&usage)) rss=usage.ru_maxrss;
+#if defined(__APPLE__)
+    uint64_t rusage_bytes=(uint64_t)rss;
+#else
+    uint64_t rusage_bytes=(uint64_t)rss*1024;
+#endif
+    uint64_t rss_bytes=image_peak_rss();
+    fprintf(stderr,"{\"status\":\"%s\",\"policy\":\"%s\",\"pool\":%s,"
+        "\"budget_bytes\":%zu,\"fixed_bytes\":%zu,\"peak_reserved_bytes\":%zu,"
+        "\"peak_active_bytes\":%zu,\"peak_queue\":%zu,\"rss_peak_bytes\":%" PRIu64 ","
+        "\"rusage_maxrss_bytes\":%" PRIu64 ",\"rss_peak_source\":\"%s\","
+        "\"elapsed_ns\":%" PRIu64 ",\"cpu_ns\":%" PRIu64 ",\"input_bytes\":%" PRIu64 ","
+        "\"output_bytes\":%" PRIu64 ",\"accepted\":%" PRIu64 ",\"emitted\":%" PRIu64 ","
+        "\"copy_bytes\":%" PRIu64 ",\"copied_records\":%" PRIu64 ",\"borrowed_records\":%" PRIu64 ","
+        "\"pressure_copies\":%" PRIu64 ",\"allocations\":%" PRIu64 ",\"reuses\":%" PRIu64 ","
+        "\"budget_waits\":%" PRIu64 ",\"slot_waits\":%" PRIu64 ",\"sleep_ns\":%" PRIu64 ","
+        "\"latency_mean_ns\":%.3f,\"latency_p99_upper_ns\":%" PRIu64 ",\"latency_max_ns\":%" PRIu64 ","
+        "\"active_byte_seconds\":%.6Lf,\"live_at_stop_bytes\":%zu,\"cached_at_stop_bytes\":%zu,"
+        "\"unreleased_buffer_bytes\":%zu}\n",
+        e->status,e->policy,e->pool?"true":"false",e->budget,e->fixed,e->fixed+e->peak_reserved,
+        e->fixed+e->peak_active,e->peak_queue,rss_bytes,rusage_bytes,
+        rss_bytes?"linux_proc_vmhwm_approximate":"unavailable",e->elapsed_ns,e->cpu_ns,e->read_bytes,
+        e->written_bytes,e->accepted,e->emitted,e->copies,e->copied_records,e->borrowed_records,
+        e->pressure_copies,e->allocations,e->reuses,e->budget_waits,e->slot_waits,e->sleep_ns,
+        e->emitted?(double)e->latency_sum/(double)e->emitted:0,p99,e->latency_max,
+        e->active_byte_ns/1e9L,live_at_stop,cached_at_stop,e->reserved);
+    int result=!strcmp(e->status,"ok")?0:!strcmp(e->status,"cancelled")?3:2;
+    free(e->queue); free(e); return result;
+}
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/plan.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/plan.json
new file mode 100644
index 0000000..1737f45
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/plan.json
@@ -0,0 +1,35 @@
+{
+  "version": 2,
+  "written_before_measurement": true,
+  "revision_note": "The v1 run is preserved. Before this v2 run, RSS instrumentation was corrected and a 64-slot sparse sensitivity case was added after observing different queue occupancy. This is an exploratory follow-up, not a pre-registered confirmation.",
+  "seed": 20260922,
+  "repeats": 5,
+  "slots": 512,
+  "policies": [
+    {"name": "borrow", "policy": "borrow", "pool": 1},
+    {"name": "copy", "policy": "copy", "pool": 1},
+    {"name": "threshold2", "policy": "threshold", "ratio": 2, "pool": 1},
+    {"name": "threshold4", "policy": "threshold", "ratio": 4, "pool": 1},
+    {"name": "threshold8", "policy": "threshold", "ratio": 8, "pool": 1},
+    {"name": "pressure", "policy": "pressure", "pool": 1},
+    {"name": "project", "policy": "project", "pool": 1},
+    {"name": "copy_no_pool", "policy": "copy", "pool": 0}
+  ],
+  "cases": [
+    {"name": "sparse_slow", "shape": "sparse", "records": 2048, "budget": 8388608, "hold_us": 5000, "service_us": 20},
+    {"name": "sparse_slots64", "shape": "sparse", "records": 2048, "budget": 8388608, "slots": 64, "hold_us": 5000, "service_us": 20},
+    {"name": "dense_slow", "shape": "dense", "records": 2048, "budget": 8388608, "hold_us": 5000, "service_us": 20},
+    {"name": "mixed_slow", "shape": "mixed", "records": 2048, "budget": 8388608, "hold_us": 5000, "service_us": 20},
+    {"name": "mixed_tight", "shape": "mixed", "records": 2048, "budget": 2097152, "hold_us": 5000, "service_us": 20},
+    {"name": "sparse_fast", "shape": "sparse", "records": 2048, "budget": 8388608, "hold_us": 0, "service_us": 0}
+  ],
+  "expectations": [
+    "Borrow retains full source allocations for small selections.",
+    "Copy can add CPU and transient source plus destination memory for dense selections.",
+    "A current-pressure rule need not outperform a static size rule or early projection.",
+    "Pool reuse can reduce allocation calls while increasing reserved idle memory.",
+    "No Pure-specific advantage, application SLO, or statistical significance is presumed."
+  ],
+  "comparison_rule": "Report all presets and repetitions; no post-hoc winner is called an out-of-sample tuned policy.",
+  "limits": "Single FIFO local pipeline with synthetic delayed sink. No Sonic/Node/.NET benchmark, fan-out, persistent cache, generic JSON parser, external open-loop arrivals, or production SLO."
+}
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/run.py b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/run.py
new file mode 100644
index 0000000..49a693c
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/sources/run.py
@@ -0,0 +1,300 @@
+#!/usr/bin/env python3
+"""Build, independently verify, and measure the retention experiment."""
+import argparse
+import csv
+import hashlib
+import json
+import os
+from pathlib import Path
+import platform
+import random
+import shlex
+import signal
+import statistics
+import struct
+import subprocess
+import tempfile
+import time
+
+ROOT = Path(__file__).resolve().parent
+FLAGS = ["-std=c17", "-Wall", "-Wextra", "-Wpedantic", "-Werror", "-O2", "-g"]
+
+
+def digest(path):
+    with open(path, "rb") as stream:
+        return hashlib.file_digest(stream, "sha256").hexdigest()
+
+
+def dump(path, value):
+    path.write_text(json.dumps(value, indent=2, ensure_ascii=False) + "\n")
+
+
+def build(cc, output, sanitizer=False):
+    command = [*cc, *FLAGS]
+    if sanitizer:
+        command += ["-fsanitize=address,undefined", "-fno-omit-frame-pointer"]
+    command += [str(ROOT / "benchmark.c"), "-o", str(output)]
+    result = subprocess.run(command, capture_output=True, text=True, check=True)
+    return {"command": command, "stderr": result.stderr, "sha256": digest(output),
+            "size_bytes": output.stat().st_size}
+
+
+def shape_for(shape, rng, i):
+    if shape == "sparse":
+        return 65536, 64
+    if shape == "dense":
+        return 65536, 49152
+    if shape == "mixed":
+        source = rng.choice([4096, 16384, 65536, 262144])
+        keep = max(16, source // rng.choice([1, 2, 4, 8, 64, 1024]))
+        return source, keep
+    if shape == "test":
+        return [(1, 1), (63, 17), (4097, 12), (65536, 49152), (127, 127)][i % 5]
+    raise ValueError(shape)
+
+
+def fixture(path, shape, count, seed):
+    rng = random.Random(seed)
+    expected = hashlib.sha256()
+    total = 0
+    with path.open("wb") as stream:
+        for i in range(count):
+            size, keep = shape_for(shape, rng, i)
+            offset = rng.randrange(size - keep + 1)
+            # All input bytes exist on disk; no sparse files or seeking past data.
+            tile = rng.randbytes(256)
+            payload = (tile * ((size + 255) // 256))[:size]
+            stream.write(struct.pack("<III", size, offset, keep))
+            stream.write(payload)
+            out = struct.pack("<I", keep) + payload[offset:offset + keep]
+            expected.update(out)
+            total += len(out)
+    return {"path": path.name, "shape": shape, "records": count, "seed": seed,
+            "input_bytes": path.stat().st_size, "input_sha256": digest(path),
+            "expected_output_bytes": total, "expected_output_sha256": expected.hexdigest()}
+
+
+def reference(data):
+    result = bytearray()
+    at = 0
+    while at < len(data):
+        if len(data) - at < 12:
+            raise ValueError("short header")
+        size, offset, keep = struct.unpack_from("<III", data, at)
+        at += 12
+        if not 0 < size <= 8 * 1024 * 1024 or not 0 < keep <= size or offset > size - keep:
+            raise ValueError("invalid frame")
+        if len(data) - at < size:
+            raise ValueError("short payload")
+        result.extend(struct.pack("<I", keep))
+        result.extend(data[at + offset:at + offset + keep])
+        at += size
+    return bytes(result)
+
+
+def command(binary, case, policy, *extra):
+    args = [str(binary), "--policy", policy["policy"], "--pool", str(policy.get("pool", 1)),
+            "--ratio", str(policy.get("ratio", 4)), "--budget", str(case.get("budget", 8388608)),
+            "--slots", str(case.get("slots", 512)), "--hold-us", str(case.get("hold_us", 0)),
+            "--service-us", str(case.get("service_us", 0))]
+    return args + list(extra)
+
+
+def metrics(stderr):
+    # Sanitizer diagnostics must not be silently ignored.
+    text = stderr.decode().strip()
+    try:
+        result = json.loads(text)
+    except json.JSONDecodeError as exc:
+        raise AssertionError(f"Expected metrics only; tool/runtime diagnostics:\n{text}") from exc
+    assert result["unreleased_buffer_bytes"] == 0, result
+    assert result["peak_active_bytes"] <= result["peak_reserved_bytes"] <= result["budget_bytes"], result
+    return result
+
+
+def check(binary, tmp, policies):
+    checks = []
+    test = tmp / "test.frames"
+    fixture(test, "test", 45, 177)
+    data = test.read_bytes()
+    expected = reference(data)
+    for policy in policies:
+        for slow in [False, True]:
+            case = {"slots": 7, "hold_us": 100 if slow else 0, "budget": 300000}
+            result = subprocess.run(command(binary, case, policy), input=data, capture_output=True, timeout=15)
+            m = metrics(result.stderr)
+            assert result.returncode == 0 and m["status"] == "ok", (policy, result.stderr)
+            assert result.stdout == expected and m["emitted"] == 45
+            assert m["input_bytes"] == len(data) and m["output_bytes"] == len(expected)
+            assert m["live_at_stop_bytes"] == 0
+            checks.append(f'{policy["name"]}: byte equality, accounting, cleanup, slow={slow}')
+        # Truncation at both header and payload boundaries, including exact missing payload.
+        bad_inputs = [b"x", struct.pack("<III", 12, 0, 4),
+                      struct.pack("<III", 12, 0, 4) + b"123",
+                      struct.pack("<III", 12, 11, 4) + b"x" * 12,
+                      struct.pack("<III", 0, 0, 0),
+                      struct.pack("<III", 8 * 1024 * 1024 + 1, 0, 1)]
+        for bad in bad_inputs:
+            result = subprocess.run(command(binary, {"hold_us": 1000}, policy),
+                                    input=data[:13] + bad, capture_output=True, timeout=15)
+            m = metrics(result.stderr)
+            assert result.returncode == 2 and m["status"] in {"invalid_frame", "truncated_input"}
+        checks.append(f'{policy["name"]}: six malformed inputs with pending buffer cleanup')
+        result = subprocess.run(command(binary, {"hold_us": 1000}, policy, "--cancel-after", "3"),
+                                input=data, capture_output=True, timeout=15)
+        m = metrics(result.stderr)
+        prefix_end = 0
+        for _ in range(3):
+            prefix_end += 4 + struct.unpack_from("<I", expected, prefix_end)[0]
+        assert result.returncode == 3 and m["status"] == "cancelled" and m["emitted"] == 3
+        assert result.stdout == expected[:prefix_end]
+        checks.append(f'{policy["name"]}: cancellation preserves completed output prefix and releases pending buffers')
+        result = subprocess.run(command(binary, {}, policy), input=b"", capture_output=True, timeout=15)
+        assert result.returncode == 0 and metrics(result.stderr)["emitted"] == 0
+        checks.append(f'{policy["name"]}: empty stream')
+    # Tight budget must refuse a whole-frame requirement, while streaming projection can work.
+    large = struct.pack("<III", 1048576, 17, 64) + b"a" * 1048576
+    for policy in policies:
+        result = subprocess.run(command(binary, {"budget": 131072, "slots": 1}, policy),
+                                input=large, capture_output=True, timeout=15)
+        m = metrics(result.stderr)
+        assert m["status"] == ("ok" if policy["policy"] == "project" else "budget_too_small")
+    checks.append("frame larger than buffer budget: bounded refusal versus projection")
+    if Path("/dev/full").exists():
+        with open("/dev/full", "wb") as sink:
+            result = subprocess.run(command(binary, {"hold_us": 1000}, policies[0]), input=data,
+                                    stdout=sink, stderr=subprocess.PIPE, timeout=15)
+        assert result.returncode == 2 and metrics(result.stderr)["status"] == "output_failed"
+        checks.append("real output failure through /dev/full, pending buffers released")
+    # Real signal cancellation after allocation, while waiting for the delayed sink.
+    with test.open("rb") as source, open(os.devnull, "wb") as sink:
+        proc = subprocess.Popen(command(binary, {"hold_us": 500000}, policies[0]),
+                                stdin=source, stdout=sink, stderr=subprocess.PIPE)
+        time.sleep(0.08)
+        proc.send_signal(signal.SIGTERM)
+        _, error = proc.communicate(timeout=5)
+    assert proc.returncode == 3 and metrics(error)["status"] == "cancelled", error
+    checks.append("SIGTERM interrupts delayed sink and releases buffers")
+    if platform.system() == "Linux":
+        # Regression: inherited rusage peak cannot stand in for current-image HWM.
+        resident = tmp / "rss.frames"
+        fixture(resident, "sparse", 512, 817)
+        values = {}
+        for policy in [{"policy": "borrow"}, {"policy": "project"}]:
+            with resident.open("rb") as source, open(os.devnull, "wb") as sink:
+                result = subprocess.run(command(binary, {"hold_us": 10000}, policy),
+                                        stdin=source, stdout=sink, stderr=subprocess.PIPE, timeout=15)
+            m = metrics(result.stderr)
+            assert result.returncode == 0 and m["rss_peak_source"] == "linux_proc_vmhwm_approximate"
+            assert m["rss_peak_bytes"] > 0
+            values[policy["policy"]] = m["rss_peak_bytes"]
+        # Only a sanity check for this deliberately wide memory gap, not exact RSS arithmetic.
+        assert values["borrow"] > values["project"], values
+        checks.append("current-image VmHWM distinguishes large retained sources from small projections")
+    return checks
+
+
+def sample(binary, source, output, case, policy):
+    with source.open("rb") as inp, output.open("wb") as out:
+        result = subprocess.run(command(binary, case, policy), stdin=inp, stdout=out,
+                                stderr=subprocess.PIPE, timeout=30)
+    m = metrics(result.stderr)
+    assert result.returncode == 0 and m["status"] == "ok", result.stderr
+    return m
+
+
+def summarize(rows):
+    result = []
+    names = ["elapsed_ns", "cpu_ns", "peak_reserved_bytes", "peak_active_bytes", "rss_peak_bytes",
+             "copy_bytes", "active_byte_seconds", "latency_mean_ns", "latency_p99_upper_ns",
+             "budget_waits", "allocations", "reuses"]
+    groups = sorted({(r["case"], r["variant"]) for r in rows})
+    for case, variant in groups:
+        group = [r for r in rows if (r["case"], r["variant"]) == (case, variant)]
+        value = {"case": case, "variant": variant, "samples": len(group)}
+        for name in names:
+            values = [r[name] for r in group]
+            value[name] = {"median": statistics.median(values), "min": min(values), "max": max(values)}
+        result.append(value)
+    return result
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--check-only", action="store_true")
+    parser.add_argument("--output", type=Path)
+    args = parser.parse_args()
+    if not args.check_only and args.output is None:
+        parser.error("provide --check-only or --output (new directory)")
+    if args.output:
+        args.output.mkdir(parents=True, exist_ok=False)
+    cc = shlex.split(os.environ.get("CC", "cc"))
+    plan = json.loads((ROOT / "plan.json").read_text())
+    affinity = None
+    if hasattr(os, "sched_getaffinity"):
+        affinity = min(os.sched_getaffinity(0))
+        os.sched_setaffinity(0, {affinity})
+    with tempfile.TemporaryDirectory(prefix="pure-retention-") as folder:
+        tmp = Path(folder)
+        native, sanitized = tmp / "bench", tmp / "bench-sanitized"
+        builds = [build(cc, native), build(cc, sanitized, True)]
+        verification = {"native": check(native, tmp, plan["policies"]),
+                        "asan_ubsan": check(sanitized, tmp, plan["policies"])}
+        print(f'Verified {sum(map(len, verification.values()))} scenario groups (native + ASan/UBSan).', flush=True)
+        if args.check_only:
+            return
+        sources = {name: digest(ROOT / name) for name in ["benchmark.c", "run.py", "plan.json"]}
+        environment = {"platform": platform.platform(), "machine": platform.machine(),
+                       "python": platform.python_version(), "cpu_affinity": affinity,
+                       "compiler": subprocess.check_output([*cc, "--version"], text=True),
+                       "builds": builds, "source_sha256": sources,
+                       "clock": "CLOCK_MONOTONIC; CPU = CLOCK_PROCESS_CPUTIME_ID",
+                       "timing": "includes file IO, scheduling, deliberate sleep, metrics, buffer cleanup; excludes startup/build/fixture/verification",
+                       "limitations": "shared host; unregulated thermals; cached files; output page cache, no fsync; synthetic closed-loop arrivals",
+                       "started_utc": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())}
+        if Path("/proc/cpuinfo").exists():
+            environment["cpuinfo"] = Path("/proc/cpuinfo").read_text()
+        dump(args.output / "environment.json", environment)
+        dump(args.output / "verification.json", verification)
+        dump(args.output / "plan.json", plan)
+        (args.output / "sources").mkdir()
+        for name in sources:
+            (args.output / "sources" / name).write_bytes((ROOT / name).read_bytes())
+        fixtures, rows = [], []
+        rng = random.Random(plan["seed"])
+        for case in plan["cases"]:
+            source, output = tmp / "input.frames", tmp / "output.frames"
+            info = fixture(source, case["shape"], case["records"], plan["seed"])
+            info["case"] = case["name"]
+            fixtures.append(info)
+            # Warm each strategy once. The following measurements use fresh processes.
+            for policy in plan["policies"]:
+                sample(native, source, output, case, policy)
+                assert digest(output) == info["expected_output_sha256"]
+            for repeat in range(plan["repeats"]):
+                order = list(plan["policies"])
+                rng.shuffle(order)
+                for policy in order:
+                    m = sample(native, source, output, case, policy)
+                    assert m["accepted"] == m["emitted"] == case["records"]
+                    assert m["input_bytes"] == info["input_bytes"]
+                    assert m["output_bytes"] == info["expected_output_bytes"]
+                    assert digest(output) == info["expected_output_sha256"]
+                    rows.append({"case": case["name"], "variant": policy["name"], "repeat": repeat, **m})
+            dump(args.output / "raw.json", rows)
+            dump(args.output / "fixtures.json", fixtures)
+            print(f'Completed {case["name"]}: {len(plan["policies"])} variants x {plan["repeats"]} trials.', flush=True)
+        dump(args.output / "summary.json", summarize(rows))
+        with (args.output / "raw.csv").open("w") as out:
+            writer = csv.DictWriter(out, fieldnames=list(rows[0]))
+            writer.writeheader()
+            writer.writerows(rows)
+        # Detect accidental source edits during a measurement run.
+        assert sources == {name: digest(ROOT / name) for name in sources}
+        dump(args.output / "complete.json", {"samples": len(rows), "all_output_hashes_match": True,
+                                             "finished_utc": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())})
+        print(args.output.resolve())
+
+
+if __name__ == "__main__":
+    main()
diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/summary.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/summary.json
new file mode 100644
index 0000000..fceebba
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/summary.json
@@ -0,0 +1,3122 @@
+[
+  {
+    "case": "dense_slow",
+    "variant": "borrow",
+    "samples": 5,
+    "elapsed_ns": {
+      "median": 176146657,
+      "min": 160544406,
+      "max": 186194683
+    },
+    "cpu_ns": {
+      "median": 82398748,
+      "min": 78514601,
+      "max": 90636057
+    },
+    "peak_reserved_bytes": {
+      "median": 8350112,
+      "min": 8350112,
+      "max": 8350112
+    },
+    "peak_active_bytes": {
+      "median": 8350112,
+      "min": 8350112,
+      "max": 8350112
+    },
+    "rss_peak_bytes": {
+      "median": 9486336,
+      "min": 9469952,
+      "max": 9486336
+    },
+    "copy_bytes": {
+      "median": 0,
+      "min": 0,
+      "max": 0
+    },
+    "active_byte_seconds": {
+      "median": 1395956.019109,
+      "min": 1263635.432461,
+      "max": 1477291.36261
+    },
+    "latency_mean_ns": {
+      "median": 10456864.841,
+      "min": 9456018.519,
+      "max": 11071491.94
+    },
+    "latency_p99_upper_ns": {
+      "median": 12582912,
+      "min": 12582912,
+      "max": 13631488
+    },
+    "budget_waits": {
+      "median": 1605,
+      "min": 1220,
+      "max": 1865
+    },
+    "allocations": {
+      "median": 126,
+      "min": 126,
+      "max": 126
+    },
+    "reuses": {
+      "median": 1922,
+      "min": 1922,
+      "max": 1922
+    }
+  },
+  {
+    "case": "dense_slow",
+    "variant": "copy",
+    "samples": 5,
+    "elapsed_ns": {
+      "median": 181070273,
+      "min": 162629252,
+      "max": 184530299
+    },
+    "cpu_ns": {
+      "median": 83392187,
+      "min": 78669541,
+      "max": 88543490
+    },
+    "peak_reserved_bytes": {
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diff --git a/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/verification.json b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/verification.json
new file mode 100644
index 0000000..539be67
--- /dev/null
+++ b/research/experiments/002-buffer-retention/results/2026-09-22-linux-aarch64-v2/verification.json
@@ -0,0 +1,94 @@
+{
+  "native": [
+    "borrow: byte equality, accounting, cleanup, slow=False",
+    "borrow: byte equality, accounting, cleanup, slow=True",
+    "borrow: six malformed inputs with pending buffer cleanup",
+    "borrow: cancellation preserves completed output prefix and releases pending buffers",
+    "borrow: empty stream",
+    "copy: byte equality, accounting, cleanup, slow=False",
+    "copy: byte equality, accounting, cleanup, slow=True",
+    "copy: six malformed inputs with pending buffer cleanup",
+    "copy: cancellation preserves completed output prefix and releases pending buffers",
+    "copy: empty stream",
+    "threshold2: byte equality, accounting, cleanup, slow=False",
+    "threshold2: byte equality, accounting, cleanup, slow=True",
+    "threshold2: six malformed inputs with pending buffer cleanup",
+    "threshold2: cancellation preserves completed output prefix and releases pending buffers",
+    "threshold2: empty stream",
+    "threshold4: byte equality, accounting, cleanup, slow=False",
+    "threshold4: byte equality, accounting, cleanup, slow=True",
+    "threshold4: six malformed inputs with pending buffer cleanup",
+    "threshold4: cancellation preserves completed output prefix and releases pending buffers",
+    "threshold4: empty stream",
+    "threshold8: byte equality, accounting, cleanup, slow=False",
+    "threshold8: byte equality, accounting, cleanup, slow=True",
+    "threshold8: six malformed inputs with pending buffer cleanup",
+    "threshold8: cancellation preserves completed output prefix and releases pending buffers",
+    "threshold8: empty stream",
+    "pressure: byte equality, accounting, cleanup, slow=False",
+    "pressure: byte equality, accounting, cleanup, slow=True",
+    "pressure: six malformed inputs with pending buffer cleanup",
+    "pressure: cancellation preserves completed output prefix and releases pending buffers",
+    "pressure: empty stream",
+    "project: byte equality, accounting, cleanup, slow=False",
+    "project: byte equality, accounting, cleanup, slow=True",
+    "project: six malformed inputs with pending buffer cleanup",
+    "project: cancellation preserves completed output prefix and releases pending buffers",
+    "project: empty stream",
+    "copy_no_pool: byte equality, accounting, cleanup, slow=False",
+    "copy_no_pool: byte equality, accounting, cleanup, slow=True",
+    "copy_no_pool: six malformed inputs with pending buffer cleanup",
+    "copy_no_pool: cancellation preserves completed output prefix and releases pending buffers",
+    "copy_no_pool: empty stream",
+    "frame larger than buffer budget: bounded refusal versus projection",
+    "real output failure through /dev/full, pending buffers released",
+    "SIGTERM interrupts delayed sink and releases buffers",
+    "current-image VmHWM distinguishes large retained sources from small projections"
+  ],
+  "asan_ubsan": [
+    "borrow: byte equality, accounting, cleanup, slow=False",
+    "borrow: byte equality, accounting, cleanup, slow=True",
+    "borrow: six malformed inputs with pending buffer cleanup",
+    "borrow: cancellation preserves completed output prefix and releases pending buffers",
+    "borrow: empty stream",
+    "copy: byte equality, accounting, cleanup, slow=False",
+    "copy: byte equality, accounting, cleanup, slow=True",
+    "copy: six malformed inputs with pending buffer cleanup",
+    "copy: cancellation preserves completed output prefix and releases pending buffers",
+    "copy: empty stream",
+    "threshold2: byte equality, accounting, cleanup, slow=False",
+    "threshold2: byte equality, accounting, cleanup, slow=True",
+    "threshold2: six malformed inputs with pending buffer cleanup",
+    "threshold2: cancellation preserves completed output prefix and releases pending buffers",
+    "threshold2: empty stream",
+    "threshold4: byte equality, accounting, cleanup, slow=False",
+    "threshold4: byte equality, accounting, cleanup, slow=True",
+    "threshold4: six malformed inputs with pending buffer cleanup",
+    "threshold4: cancellation preserves completed output prefix and releases pending buffers",
+    "threshold4: empty stream",
+    "threshold8: byte equality, accounting, cleanup, slow=False",
+    "threshold8: byte equality, accounting, cleanup, slow=True",
+    "threshold8: six malformed inputs with pending buffer cleanup",
+    "threshold8: cancellation preserves completed output prefix and releases pending buffers",
+    "threshold8: empty stream",
+    "pressure: byte equality, accounting, cleanup, slow=False",
+    "pressure: byte equality, accounting, cleanup, slow=True",
+    "pressure: six malformed inputs with pending buffer cleanup",
+    "pressure: cancellation preserves completed output prefix and releases pending buffers",
+    "pressure: empty stream",
+    "project: byte equality, accounting, cleanup, slow=False",
+    "project: byte equality, accounting, cleanup, slow=True",
+    "project: six malformed inputs with pending buffer cleanup",
+    "project: cancellation preserves completed output prefix and releases pending buffers",
+    "project: empty stream",
+    "copy_no_pool: byte equality, accounting, cleanup, slow=False",
+    "copy_no_pool: byte equality, accounting, cleanup, slow=True",
+    "copy_no_pool: six malformed inputs with pending buffer cleanup",
+    "copy_no_pool: cancellation preserves completed output prefix and releases pending buffers",
+    "copy_no_pool: empty stream",
+    "frame larger than buffer budget: bounded refusal versus projection",
+    "real output failure through /dev/full, pending buffers released",
+    "SIGTERM interrupts delayed sink and releases buffers",
+    "current-image VmHWM distinguishes large retained sources from small projections"
+  ]
+}