docs(progress): sync t4.2 completion

[DeliciousBuding]

Summary

• Sync docs/progress/MASTER.md after test(chat): add visual qa artifact reports #414 merged and [T4.2] Add semi-automated Visual QA artifact loop #390 was manually closed.
• Mark Phase 4 as 2/3 complete and set T4.3 ([T4.3] Keep packaged Desktop claim separate #391) as the active next task.

Evidence

• git diff --check
• pwsh ./scripts/verify/verify-doc-ssot.ps1

Summary by CodeRabbit

• Documentation
  • Updated the Phase 4 progress tracking to reflect the latest task completion status.
  • Marked one task as closed and moved the active focus to the next task.
  • Refreshed the current status, blockers, and next steps to match the latest project progress and QA guidance.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: ba48324b-c3bb-414c-aacf-ed6571e7e17e

📥 Commits

Reviewing files that changed from the base of the PR and between de666c5 and 43cc512.

📒 Files selected for processing (1)

• docs/progress/MASTER.md

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📝 Walkthrough

Walkthrough

docs/progress/MASTER.md is updated to reflect T4.2 (#390) closure via PR #414. Milestone #20 shifts to 1 open / 2 closed. Phase 4 completion advances from 1/3 to 2/3, the active task switches to T4.3 (#391), Next Steps are revised, and the Session Log entry is updated accordingly.

Phase 4 Progress Doc Update

Layer / File(s)	Summary
Phase 4 status, next steps, and session log docs/progress/MASTER.md	Milestone #20 open/closed counts updated, T4.2 marked closed via #414, phase checklist advanced to 2/3, active task switched to T4.3 (#391), Next Steps rewritten to separate packaged Desktop-side claims from Vite/fixture Visual QA evidence, and Session Log entry updated.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• TokenDanceLab/AgentHub#413: Directly updates the same Phase 4 tracker in docs/progress/MASTER.md around tasks #390/[T4.1] Add focused chat acceptance gate #389, immediately preceding this PR's state transition.
• TokenDanceLab/AgentHub#409: Applies the same pattern of closing the active task and advancing the phase checklist/session log in MASTER.md for Phase 3 (T3.2→T3.3).
• TokenDanceLab/AgentHub#400: Edits the same docs/progress/MASTER.md milestone/task closure and Session Log fields using the same structural update pattern.

Poem

🐇 Hop, hop, the milestone flips,
T4.2 closed — no more slips!
The tracker ticks from one to two,
T4.3 now leads the queue.
On to Visual QA we go,
keeping Desktop claims in row! 🎉

🚥 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 accurately reflects the main change: syncing T4.2 completion in the progress docs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/414-progress-sync

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