Kinneyzhang fd1210e557 fix: close repository audit findings

Complete task002 through task016 across cache correctness, editor lifecycle, C boundaries, build and release governance, dictionary provenance, performance, interactive workflows, tests, documentation, and final cleanup.

2026-07-28 22:43:10 +08:00

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Plan: Property-Sensitive Paragraph Fast Path 2026-07-28

Scope

Fix issue010 only: mutating layout-relevant text properties on an already cached string object must not reuse stale paragraph preprocessing.

Resolution Path

Warm the public paragraph resolver with the exact string object.
Mutate ekp-no-break on that object and prove the current fast path returns stale boxes/break permissions.
Make the fast path compare the same complete structural paragraph key as the hash cache instead of maintaining a partial parallel signature.
Remove invalidation watchers that become redundant once one key owns both paths.
Verify the mutated object matches a fresh computation across CJK and Latin-with-space inputs, then rerun every final gate.

Ownership

ekp--para-key is the sole owner of paragraph preprocessing identity. The most-recent lookup may bypass the hash table, but it may not bypass or partially reimplement that key.

Non-goals

No new cache layer or eager global invalidation.
No public API, rendering, C ABI, or serialized-data change.
No attempt to observe arbitrary font/theme mutation; the documented ekp-clear-caches boundary remains unchanged.

Rollback

Restore the partial fast-path tuple and its variable watchers. No persisted state needs migration, but the same-object property regression returns.

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