board: record R6–R8 and the twice-repeated measurement-ledger defect - #25
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PR #24 merged the R4-R8 arc but carried a board entry for R4/R5 only. This discharges the rest, and records the defect that arc produced twice. R7 shipped prose quoting a throughput range its own pinned runs contradicted. It was repaired -- and R8 committed the identical defect one commit later. Root cause is mechanical: prose hand-copied from run N while the raw block was regenerated at run N+1, which makes every such artifact one regeneration away from lying about itself. Repaired structurally by generating the report from the runs it just captured. That turned out to be the right shape rather than merely a safer one: the first regeneration moved B' ~25% while every structural conclusion held identically. The stability of conclusions under unstable absolutes is itself the result, and only a regenerable artifact can show it. Also records the two other review findings (toolchain not unified across the control and the arm; sweep-only comparison understating the lawful mask shape, which wins END-TO-END once population construction is counted) and the R6-R8 measured architecture.
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…ation Operator review: 'bulk FFI equals standalone Rust' is broader than the comparison supports. One generated run had the in-JVM arm FASTER than the standalone process -- which cannot mean the crossing is better than free; it means process/JIT/turbo/cache context is larger than any crossing cost, so the two arms must not be called performance-identical. The banked claim is now 'one bulk Panama crossing shows no measurable penalty at this scale'. Rather than trust prose to preserve that distinction, r8_report.py DETECTS which of three cases a run lands in (in-JVM faster / slower / ranges overlap) and states it -- the same structural fix as generating the ranges themselves, applied to the interpretation. Board entry also records the shape that is the actual discovery: a mask is not metadata accompanying computation, it is partial evaluation OF it -- each mask answers a question once so the ALU never asks it again. Part 1 remains the scope leg: where there was no question, answering early buys nothing.
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PR_ARC_INVENTORY had entries for #1-#12, #14, #16, #18, #20 and #32, and nothing else. Missing: #13, #22-#31, #33-#41 — twenty PRs. (#15/#17/#19/#21 are also absent and correctly so: each is itself an arc-entry-only PR, exempt under the termination clause.) #32's own entry still read "(draft, opened …)" with no merge sha. Corrects this branch's first count, which said nineteen and read the gap as starting at #21. Both were wrong — it is twenty, and it starts at #13. The first count was a range subtraction over a file with holes; the enumeration is what found the difference. Method, which is the point rather than an aside: each entry drafted from that PR's own body and diff, five parallel agents over four PRs each, none permitted to work from a later session's recall. Every backfilled entry's Confidence bullet ends "Backfilled 2026-08-27 from the PR body and diff, not written at merge time", so reconstructed entries are distinguishable from ones written at merge time; several state which claims are the PR body's own and were not re-verified. Every cited sha, date and merge-vs- squash label machine-checked against git. Four things the backfill turned up, each recorded in the entry it belongs to: #25's body asserts "no code, no reproducer changes" and its own diff contradicts it; #39 left its lgj_hop doc comment describing the pre-change design; #34's banked evidence file did not identify its own JDK; and #41 is on main while its own title reads [DO NOT MERGE AS-IS], recorded as unresolved disposition rather than an endorsement. ISS-LGJ-ARC-INVENTORY-STOPPED-AT-32 moves to RESOLVED with the corrected count and the standing rule restated: the entry goes in at open, in the PR's own commit. The backfill is the repair, not the process. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCfrD5y19cvFc4AoyydXYv
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Board hygiene for the R4–R8 arc merged in #24, which carried an entry for R4/R5 only.
Docs-only: one append-only entry in
.claude/board/EPIPHANIES.md. No code, no reproducer changes.What it records
The defect that arc produced twice.
R7-observed.txtshipped with prose quoting a throughput range its own pinned runs contradicted. That was caught and repaired — and R8 committed the identical defect one commit later. Root cause is mechanical, not attentional: prose hand-copied from run N while the raw block was regenerated at run N+1, which leaves every such artifact one regeneration away from lying about itself. Repaired structurally in #24 by generating the report from the runs it just captured.Worth recording because the repair turned out to be the right shape rather than merely a safer one: the first regeneration moved B′ ~25% while every structural conclusion held identically. The stability of conclusions under unstable absolutes is itself the result, and only a regenerable artifact can expose it — a hand-pinned one hides it.
Two further review findings, both real: the toolchain was not unified across the control and the arm (1.94.1 vs 1.97.1, an escape hatch on the "bulk FFI costs nothing" claim), and the sweep-only comparison understated the lawful mask shape, which wins end-to-end once population construction is counted.
The R6–R8 measured architecture, so a future session does not reconstruct it from commit messages: JEP 401's atomicity cause for the 8-byte cliff (and that
UseArrayFlattening/UseFieldFlatteningarefalseby default, so the flags-on run had to be done rather than assumed); 10⁹ projections at 960 B total; and the five-arm entropy-boundary result with its control leg.Generated by Claude Code