docs(risk-register): C-66 — track the deferred .values write-protection (C-63 enforce-rider)#192
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…on (C-63 enforce-rider) C-63 was resolved by correcting the contract (ADR-025), but the actual setflags(write=False) enforce on the value buffer was deferred to the next MAJOR (it tightens an invariant on the frozen-surface `values`). That deferred safety work lived only in ADR-025 + the resolved C-63 residual — invisible when scanning open risks. Register C-66 (Tier 3, Open) as its home: trigger = the next MAJOR (add the one-line-per-constructor setflags + a red test, riding it free) or a consumer found mutating .values in place. Also: restore the immutability cluster (now C-66-open) in the intro + causal notes, fix a stale intro open-count (12 vs header 11 → both 12), bump Last Updated. Counts: total 62→63, open 11→12, resolved 51. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Register-curation follow-up to epic #179 (matches the #177/#178 register commits).
C-66 (Tier 3, Open) gives the deferred
.valueswrite-protection an open home.C-63 was resolved by correcting the contract (ADR-025), but the code is unchanged — the
value buffer is still writeable, so the silent shared-buffer-corruption mechanism is
mitigated (documented-unsupported + nothing mutates it), not removed. The
setflags-enforceis a MAJOR (frozen-surface
values; GOVERNANCE/ADR-018), so it's deferred. C-66 tracks thatenforce-rider so it stays visible in Open rather than buried in a resolved entry.
setflags(write=False)to the 3 constructors + ared test, riding it free) or a consumer is found mutating
.valuesin place.stale intro open-count (12 vs header 11 → both 12);
Last Updated→ 2026-06-28.Register-only;
validate_docs✅ ·ruff✅.🤖 Generated with Claude Code