Four findings, all confirmed against the tree.
The accept-set "deviation" was not real, and I propagated it. bundle.rs:1322
has asserted max_supported_major(OperationEnvelopeBlock) == 2 since before
this packet, so the gate was always satisfiable; the privacy observation about
the symbol not being re-exported is true but irrelevant, because the assertion
never needed to live outside the crate. I checked the premise and not the
conclusion, then reported it as verified. No re-export is needed here or by
G-minor. The test now also asserts what the contract actually asked for -- that
a staged block carrying either kind stamps major 0, exercising the writer-side
derivation rather than the bare kind.
s3 asserted effects only, though the contract required chain growth too. A
mutant returning Applied while skipping WriteChain::record for an unchanged
value passed it, and the damage would surface only later as an undo restoring
the base instead of reporting supersession. The two identical writes now sit in
different transactions and a strict undo of the first must report the second as
superseding; mutation (b) kills exactly that half while the effects half stays
green.
s9 claimed no mutation was needed because the test is itself a reject-path
exercise. That reasoning was wrong: being a reject-path test does not show the
rejection is caused by the mislabeling rather than something incidental. The
mutation -- a parse arm that silently accepts a mismatched shape -- was both
performable and killing.
core_spec grouped SetCanvasLayoutDefaults and CreateInstrument as leaves with a
single layout. True only of the first. Instrument has distinct major-0/1/2
layouts and stamps major 2 unconditionally because its major-2 appends are
mandatory, so it is not major 1 for the opposite reason. Split.
All ten contract mutations now have observed kill evidence: s1, s2, s4, s8 and
s10's row-28 half were run here alongside the four recorded earlier. s8 killed
only the two pinned literal-byte vectors while 217 round-trip tests stayed
green -- the 3b-i property, demonstrated rather than asserted.
Gate: fmt clean, clippy 0, 1371 passed / 0 failed, conformance 8/8 and 9/9,
labels 6/6, core_spec PDF 0 undefined refs, goldens byte-identical,
epiphany-bundle diff empty.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QjsEnYhm1gPpf6ii2iFxFV
Levi Neuwirth
55eff00778