The S38 checkpoint gated the phase's best lever ("do NOT scale the alias lever") on
distinct-code falling 89.3 -> 89.2. It never fell.
PROOF (each commit's metric recomputed from its OWN committed tree, 0 unresolved):
commit:1426 TRUE : instr 12394533 distinct 5022306 (77895 uniq)
commit:1426 COMMITTED: instr 12402412 distinct 5029324 (78025 uniq) <- stale
HEAD TRUE == COMMITTED: instr 12405402 distinct 5025082 (77952 uniq)
=> true delta 843->HEAD: instr +10869, distinct +2776 ins / +57 uniq. ALL ROSE.
The 843 digest was generated from a working tree still holding work REVERTED before the
commit landed (+7,879 ins / +130 uniq overstated) and never regenerated, so the next
HONEST digest read as a fall. => THE ALIAS LEVER IS UNGATED (scale it, §61 small batches).
Both recorded leads were wrong (R14): progress.py:423's SIG regex feeds fn-count ONLY
(neither weighted metric sees a C identifier — both derive matched = sig - corpus.stubs),
and "the harvest reverted functions to INCLUDE_ASM" died on one grep (483 removed, 0 added).
The 3-grep proof: identical sigs + unchanged tools/ + zero +INCLUDE_ASM => HEAD's stub set
is a strict subset => both numerators are FORBIDDEN to fall.
THREE INSTRUMENT DEFECTS, all one class (a bare except around a fail-CLOSED oracle):
- progress.py stub_addrs wrapped corpus.stubs in `except Exception: return set()`. An empty
stub set means "could not answer", not "no stubs", so matched = sig - stubs credited EVERY
function. Byte-witnessed: instr 100.00% / distinct 100.00% in a tree with no asm/. Now
propagates.
- cast_call_sites.tu_for + reconcile_tu.tu_for had the identical swallow, falling back to the
default <ov>.c instead of the jr/-O0 split TU — silently reinstating the exact bug
cast_call_sites' own docstring says it exists to fix. A wrong-TU reconcile fails the gate,
and this phase's base rate is ~24k PLUMBING vs 4,917 DIFF, so it presents as a codegen wall.
Now propagate CorpusError; ValueError fallback for curated names preserved; derived-TU path
re-verified (a _jr_ split stub resolves correctly, both tools agree).
NEW GATE (R34 — the byte-gate is a null oracle for DOCUMENTS; check-all stays 140/140 over a
stale digest forever): tools/audit_digest.py + `make audit-digest`, wired into tools-health
after report. Recomputes the three headline metrics from the current tree and fails if the
committed digest disagrees. Compares INTEGERS, not percentages — the +7,879-instruction
staleness printed as "94.4%" on both sides. Negative-control-proven against the stale 843
digest (fails, exit 1) and green on HEAD.
Verified: make report exit 0 (dedup-check 1910 validated / 0 failed, C1 coverage
241216/241216); audit-digest OK; cookbook-index OK (398 sections); metrics unchanged by the
fix (94.40% / 89.18%). No src/ or config/ edits — no bytes touched, nothing banked.
cookbook §140 · decision-log 2026-08-04 · SETUP.md inventory (R21) · R14/R32/R34/R35.
Drew T
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