CM-4: spec-amendment sketch — release rule, blast radius, Invariant #3 carve-out - #29
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… Invariant #3 carve-out)
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Completes the CM-4 filing kit:
exams/wasmtime-exclusivity/spec-amendment.mdexplains in plain language how and why upstream would amend the spec toward the wast/wasmtime release-at-resolution semantics. Names the five spec-repo artifacts the change touches (definitions.py 3-hunk fix, CanonicalABI.md:3740–3748 prose, Concurrency.md reading, test_callback_interleaving's two hold-encoding sites, Explainer.md Invariant #3) and calls out the one piece the existing artifacts didn't: Invariant #3's shadow-stack LIFO promise must be scoped to pre-resolution execution — a toolchain-visible carve-out, forced if the wast corpus stands. Records the verified authorship fact (both corpora are Luke Wagner's; the wast side is newer) and the process precedent (CM-3, same triangle, same direction).Docs-only; findings tracker's CM-4 artifact list updated to point at it.