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diff --git a/research/experiments/002-buffer-retention/plan.json b/research/experiments/002-buffer-retention/plan.json
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+{
+  "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."
+}