docs(progress): sync phase 4 completion

[DeliciousBuding]

Summary

• Sync docs/progress/MASTER.md after test(chat): separate packaged desktop evidence #416 merged and [T4.3] Keep packaged Desktop claim separate #391 was manually closed.
• Mark Phase 4 complete and set Phase 5 / T5.1 ([T5.1] Run final acceptance matrix #392) as active.

Evidence

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

Summary by CodeRabbit

• Documentation
  • Updated project progress tracking to show Phase 4 as complete.
  • Marked the related task as closed and moved the active focus to Phase 5.
  • Revised next steps and session notes to reflect the latest milestone status.

[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: a1d26ec7-ae22-4ed9-ab31-c9d6f1496cf4

📥 Commits

Reviewing files that changed from the base of the PR and between 76ced46 and 1574387.

📒 Files selected for processing (1)

• docs/progress/MASTER.md

---

📝 Walkthrough

Walkthrough

docs/progress/MASTER.md is updated to close Phase 4 (milestone #20, task T4.3 via #416) and activate Phase 5 with T5.1 as the current task. Milestone counts, issue mapping, phase checklist, next steps, and session log are all revised accordingly.

Changes

Phase 4 → Phase 5 tracker update

Layer / File(s)	Summary
Milestone, issue, checklist, next steps, and session log docs/progress/MASTER.md	Phase 4 milestone row set to 0 open/3 closed; T4.3 marked closed via #416``; phase checklist/current status switched to Phase 5/T5.1; next steps rewritten for T5.1; session log entry states milestone #20 closed and Phase 5/#392 active.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• TokenDanceLab/AgentHub#415: Updates the same MASTER.md Phase 4 tracking, advancing from T4.2 to T4.3 — the direct predecessor to this PR's Phase 4 closure.
• TokenDanceLab/AgentHub#411: Updates the same tracker to advance Phase 3 → Phase 4, following the same structural pattern as this PR.
• TokenDanceLab/AgentHub#413: Modifies the same Phase 4 milestone/task states and session log entries in MASTER.md.

Poem

🐇 Hippity-hop, Phase Four is done,
The milestone is closed, the rabbit has won!
T4.3 shut tight with a #416 bow,
Now T5.1 steals the show.
Onward we bound through the progress log's glow! 🌟

🚥 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 clearly matches the main change: syncing progress docs for Phase 4 completion.
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/416-progress-sync

---

_{Comment @coderabbitai help to get the list of available commands.}