Four 0.87.6 follow-ups from the adversarial review:
1. **Migration 0031 pre-dedup.** Demote all-but-lowest-id duplicate
`analyze_page` rows in `(pending|running)` to `dead` before
creating the unique index, with a curator-recoverable last_error
marker. Without this, `sqlx::migrate!` would refuse to boot on
any dirty production DB.
2. **`enqueue_for_page(force=true)` collision.** The partial unique
index used to silently swallow force requests when a
`force=false` job was already pending. Repo function now upgrades
the pending row's `force` flag in place (or falls through to
re-INSERT if the sibling drained mid-call), and reports an
`EnqueueForPageOutcome` for accurate auditing.
3. **`record_duration` gate test.** New test seeds a `done` row with
known duration, force-re-analyzes with failing dispatcher +
max_attempts=3 (non-terminal), asserts duration_ms wasn't
overwritten.
4. **`bookmark.rs` PK comment correction.** Use `b.id DESC` instead
of the wrong `manga_id`; PK is actually `id`, and migration 0004
allows both chapter-level and manga-level bookmarks on the same
manga.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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