docs(progress): sync phase 3 completion

[DeliciousBuding]

Summary

• Sync docs/progress/MASTER.md after test(e2e): harden approved-real manifest boundaries #410 merged and [T3.3] Observed and approved-real manifest boundary #388 was manually closed.
• Mark Phase 3 complete at 3/3 and record the adaptive checkpoint required before Phase 4.

Tests

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

Evidence Boundary

Docs-only progress sync. No runtime, real login, model/API, packaged Desktop, signing, or release claim.

Summary by CodeRabbit

• Documentation
  • Updated progress tracking to show Phase 3 as complete and Phase 4 as the next target.
  • Refreshed milestone, issue mapping, checklist, and status sections to reflect the latest completion state.
  • Revised next-step guidance to use a checkpoint before beginning the next phase task.

[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: 2d41a768-f511-4c46-9380-38824c1ae34d

📥 Commits

Reviewing files that changed from the base of the PR and between 3c907a4 and f80bf06.

📒 Files selected for processing (1)

• docs/progress/MASTER.md

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📝 Walkthrough

Walkthrough

docs/progress/MASTER.md is updated to record Phase 3 as fully complete: the milestone row, issue mapping for T3.3 (#388), phase checklist, current status, next steps, and session log are all revised to reflect closure via #410 and to set up an adaptive checkpoint before Phase 4.

Changes

Phase 3 Completion Tracker

Layer / File(s)	Summary
Milestone table, issue mapping, and session log docs/progress/MASTER.md	Phase 3 milestone row set to 0 open/3 closed; T3.3 (#388) marked closed via #410; session log records merge, milestone #19 closure at 3/3, and drift_score 2.
Checklist, current status, and next steps docs/progress/MASTER.md	Phase 3 checked complete (3/3); active task/blockers shifted to adaptive checkpoint before T4.1 (#389); Next Steps replaced with checkpoint-then-separate-worktree instructions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• TokenDanceLab/AgentHub#394: Initialized the same docs/progress/MASTER.md tracker with the Phase 1–5 milestone/checklist/task tables and initial session log that this PR updates.
• TokenDanceLab/AgentHub#409: Synced T3.2/[T3.2] Desktop entry-preflight vs workbench-runtime split #387 closure and shifted focus to T3.3/[T3.3] Observed and approved-real manifest boundary #388, directly preceding this PR's closure of T3.3 via #410.
• TokenDanceLab/AgentHub#407: Also modifies docs/progress/MASTER.md to sync Phase 3 issue mapping, checklist, and session log entries.

Poem

🐇 Hop, hop, Phase Three is done!
Three tasks closed, the milestone won,
drift_score 2 — not bad at all,
A checkpoint waits before the fall
into Phase Four where new bugs call.
Onwards we bound, one sprint at a time! 🌟

🚥 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 summarizes the docs-only update syncing Phase 3 completion and matches the main change.
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/phase3-progress-sync

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