docs(analysis): rescore-5 notes + MASTER residual open-set (#1252)

[DeliciousBuding]

Land rescore-5 sheets (gate min~70 Iterate after #1247) and refresh MASTER open-set to #1251.

Closes #1252

Summary by CodeRabbit

• Documentation
  • Added visual QA rescore documentation with platform and theme score breakdowns.
  • Recorded the overall “Iterate” result and prioritized follow-up improvements for visual polish, accessibility, and motion.
  • Updated the progress tracker with the latest Phase 74 status, gate results, milestones, and next steps.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 2e6c20bc-a9ec-4706-a69b-57e15fb85a1d

📥 Commits

Reviewing files that changed from the base of the PR and between 72e7c67 and 230e726.

📒 Files selected for processing (2)

• docs/analysis/visual-qa-score-2026-07-19-rescore-5.md
• docs/progress/MASTER.md

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📝 Walkthrough

Walkthrough

Adds the Rescore-5 visual QA report and updates Phase 74 tracking to reflect its scores, gate result, active residual, issue mapping, next steps, session log, and completion notes.

Changes

Visual QA Rescore 5

Layer / File(s)	Summary
Rescore-5 score report docs/analysis/visual-qa-score-2026-07-19-rescore-5.md	Records Desktop and Web light/dark score sheets, the 70 → Iterate gate calculation, prior band progression, and prioritized follow-up failures.

Phase 74 Progress Tracking

Layer / File(s)	Summary
Phase 74 tracker synchronization docs/progress/MASTER.md	Updates rescore references, merged PR ranges, issue mapping, checklist, current status, next steps, session log, and completion notes for Rescore-5 and residual #1251.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• TokenDanceLab/AgentHub#554: Updates Phase/task status, next steps, session log, and completion notes in docs/progress/MASTER.md.
• TokenDanceLab/AgentHub#916: Updates phase/gate progress and related status and issue-mapping entries.
• TokenDanceLab/AgentHub#1048: Advances Visual QA rescore and phase-tracking metadata in docs/progress/MASTER.md.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is specific and matches the main docs update for rescore-5 notes and MASTER residual open-set work.
Linked Issues check	✅ Passed	The changes add the rescore-5 analysis note and refresh MASTER through the updated open-set, matching #1252 scope.
Out of Scope Changes check	✅ Passed	The edits stay within the documented analysis and MASTER tracker updates and do not show unrelated scope creep.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/1252-rescore5-master

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