* refactor: consolidate coercion ownership
Centralize four canonical coercion helpers, migrate exact core and plugin duplicates through narrow Plugin SDK facades, and enforce declaration and plugin-normalization ownership boundaries.
The sweep adds eight focused SDK exports while deleting more production and tooling code than it adds. User-visible behavior is unchanged except for safer equivalent object and UI parsing at existing boundaries.
* fix: guard integer option ownership
Register resolveIntegerOption with the canonical function owner and extend the declaration-guard fixture so future local duplicates fail validation.
* fix: keep integer helpers on numeric facade
Remove the unshipped duplicate string-coerce exports and route every affected plugin consumer through the existing number-runtime contract.
* fix: point numeric coercion to number runtime
Make boundary and declaration diagnostics recommend the canonical numeric facade, with failing-before coverage for both guidance paths.
scripts/pr review artifacts carried no PR identity, so a review authored for
another PR validated clean and could gate someone else's landing. Stamp both
review.json and review.md with the reviewed PR number and head, anchor
pr-meta.json to the guarded pr-meta.env, and re-stamp foreign artifacts on init
instead of silently adopting them. review-claim now works in the PR worktree so
no subcommand writes review state to the shared canonical checkout.
Peter Steinberger