046: 029's principle 2 put to its breaking experiment on one Pi, the tools and the numbers: an owner (pure-run --store) with shim.so preloaded ships every change its store makes to its files (ops.h: create, write, truncate, allocate, rename, unlink, mkdir), cut at each fsync or fdatasync, over pure link (shipper.c, follower.c), and its sync returns once the follower has the cut (synchronous: one cut in flight, no log); identity: 100,000 messages (200,081 cuts; 34 compactions, an image written again) and 200,000 (400,149 cuts; 67 compactions, a second log segment), the stores compared byte for byte every 1,999 and 3,001 cuts and at the end: 0 differences, the follower's store opened as owner holding every message; takeover: 70 kill -9s (owner alone, the whole node, the node with cuts of 512 and 64 B records): all open, hold every message the owner said done, none not sent, the entries in order (and equal to the owner's own store each time); prefixes: 867 op boundaries of a 100,000-message stream (568 within cuts, 266 around installs) opened as stores: all pass; the price: 204 to 400 us a message on tmpfs (155 us waiting for acks, two cuts a message), 903 bytes shipped a message, 42% of them zeros written ahead (a compaction's new file and the tree's tail)

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diff --git a/research/experiments/046-commit-replica/2026-10-19-prefixes.jsonl b/research/experiments/046-commit-replica/2026-10-19-prefixes.jsonl
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+{"run": "prefixes", "events": 20000, "ops": 101464, "journal_bytes": 18144281, "samples": 301, "within_cuts": 195, "failed": 0, "failures": [], "seconds": 3.1}
+{"run": "prefixes", "events": 100000, "ops": 507150, "journal_bytes": 90258606, "renamed_to": {"pure.tree": 34, "image-entries": 2, "image-0heard": 1, "image-0sent": 1}, "samples": 867, "near_renames": 266, "within_cuts": 568, "failed": 0, "failures": [], "seconds": 22.8}