Add IGN mirror + task verifiers (site by @Edlison, verifiers by reviewer)

[Django-Jiang]

Review: IGN mirror (PR #61) — reviewer verifiers + grading contract

Reviewed on branch Edlison/main, built webharbor:ign-review, ran on alt ports
(:8204 / 41300-41316). IGN is site index 16 (port 40016).

Mechanical checks: PASS

• All 17 sites return 200 (41300-41316)
• Control plane healthy (_health → 109 items, 4 users, ok)
• Byte-identical reset: md5 = da9379739f89373db60e2c32e801bc60 (instance == instance_seed), stable across repeated reset + full task-driving
• POST /reset-all → 17/17 ready in <1s
• Assets: .assets-revision pinned to refs/pr/41; fetch_assets.sh ign succeeds (paired HF PR: dataset discussions/41). Maintainer must bump to the merged SHA once the HF PR lands.

Visual fidelity: PASS

• Home renders 36/36 real content images (all under /static/images/content/), IGN-style dark rail + cards.
• Detail / listing / reviews / videos / guides pages populate correctly.

Functional depth: PASS (driven via real Playwright form submissions, confirmed against the DB)

• Login (all 4 benchmark users, TestPass123!)
• Save story with folder + note; playlist add with status + note; comment; guide-checklist completion; alert create + pause; remove saved; profile region edit — all persist to SQLite.

Task quality: 2 issues found — both FIXED in this PR

1. IGN--5 was infeasible (BLOCKER, fixed). The task requires favorite platform =
   Nintendo Switch 2, but account_edit.html's <select name="favorite_platform"> only
   offered PC / PlayStation 5 / Xbox Series X/S / Nintendo Switch / Mobile — no agent could
   set "Nintendo Switch 2". Fix applied: added Nintendo Switch 2 to that select. The task
   is now completable end-to-end (verified). (The region half is free text and already worked.)

2. IGN--16 was pre-satisfied by the seed (WEAK, fixed). seed_benchmark_users already put
   the FF7 Rebirth video in alice's playlist as queued — the task's exact target — so the
   after-state couldn't confirm the "add". Fix applied: retargeted IGN--16 to the "Dragon
   Ball Xenoverse 2 – Official Future Saga Chapter 4 Trailer" video, which is NOT in alice's
   seed playlist, so the DB check is now discriminating (no-op FAILs, genuine add PASSes).

Minor (non-blocking, left as-is): IGN--0's story title exists as both an article (id 1) and a
same-title video (id 40); only the article is saveable (the video page has no save form), so
"open the story" means the article. Search matches all video-type items on any query
containing the token "video" — heavy distractors, but IGN--17 is NOT leaked (Platforms render
only on the detail page; the "Switch 2" text on the search page is an unrelated distractor
video title).

Grading contract authored (reviewer)

• sites/ign/verify/verify_lib.py (shared deterministic + anchored-LLM utilities) + 19
  per-task verifiers verify_0.py … verify_18.py.
• tasks.jsonl backfilled with verifier_path + judge_rubric per row; no answer key.
• Deterministic-first: navigation evidence (anti knowledge-shortcut) + on-page answer match +
  SQLite after-state (saved folder/note, playlist status, comment body, guide-checkpoint
  completed, alert active flag, profile fields). LLM/screenshot checks are anchored on ground
  truth and SKIP (never fail-close) when the LLM is unavailable.

Grading validation

• No-op (homepage only, empty answer, DB = seed): all 19 verifiers FAIL. Zero false positives.
• Genuine completion (real form-driven actions): all 19 PASS — including IGN--5 and IGN--16
  after the fixes above.
• Wrong answer (read-only 4/17 naming the wrong item): FAIL.
• Shortcut (correct answer, no detail-page nav): FAIL on the nav gate.
• State-mismatch (correct nav, DB reverted to seed): FAIL on the DB gate.
• eval_judge.py --verifier True runs the task's verifier from verifier_path and writes
  eval.json (confirmed pass=True on a completed run).
• Byte-identical reset holds after the site fix + all task-driving (md5 unchanged).

Verdict

Grading contract is ready and both task-quality issues are fixed in-PR. All 19 tasks are
feasible and deterministically gradable.