Discovery final review fixes: lean publish, robust scoring, cheap prune (BL-0051)

- Cache prune counts directory entries first and only reads files when over
  the cap; tests for cross-kind prune, schema-mismatch and corrupt entries.
- Scoring tolerates malformed manga.json and cached records (non-list tags,
  object or null relations, non-object items); a tag without a rank no longer
  passes the top-tag filter; authors without an integer AniList id are dropped.
- discovery.json publishes only candidates some feed shows; examined/clipped
  still describe the pool. Tests that asserted the published count equals the
  pool size now check the pool via candidatePool() and the published set
  against the feeds.
- The post-harvest rescore failure test now breaks discovery.json right before
  the publish (via a scraper stand-in) instead of relying on tags: 5, and a
  following successful harvest clears the stale lastError.
- Consent text names everything sent to AniList; paused label mentions admin
  harvests; the UI test asserts the XSS seed instead of skipping it.
- Slot-mix test proves the fresh/outside reservations matter.
- Docs: privacy note, fresh fallback reason, per-period cap, dry-run wording,
  published-candidate rule; plan/spec hygiene and spec status.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/superpowers/plans/2026-10-25-discovery-wider-pool.md

@@ -334,4 +334,4 @@
 - [ ] **Step 3: Implement** the UI and docs.
 - [ ] **Step 4: Run** the same two commands, then `npm test`. Expected: PASS.
 - [ ] **Step 5: Commit** `Discover page: refresh, harvest admin and seed reasons; docs (BL-0051)` and push.
-- [ ] **Step 6: Update MangaOrg**: run `python D:\Projects\Manga\MangaOrg\tools\org.py` to set BL-0051 to `review`, release the `MangaCircus discovery` claim, then commit and push MangaOrg. Merging into `main` waits for the user.
+- [ ] **Step 6: Update the project's coordination backlog item and release the claim.** Merging into `main` waits for the user.