docs: thin-update MASTER progress P43→P44 (#876)

[DeliciousBuding]

Closes #876

Summary

Thin-update docs/progress/MASTER.md from Phase 43 → Phase 44:

• Close Phase 43 rollup (PRs docs: thin-update MASTER progress P42→P43 (#865) #871–fix(edge): separate attempt-cleanup from terminal finish on fault-escalation (#867) #875; issues P43: MASTER thin-update P42→P43 #865–P43: Hygiene — prune stale worktrees/branches, repo tidy #870)
• Open Phase 44 section (issues P44: MASTER thin-update P43→P44 #876–P44: Hygiene — prune review/phase worktrees after Wave1 #881, milestone 65)
• Update milestones, issue mapping, checklist, current status, next steps, session log, completion notes
• Keep file ≤150 lines

Test evidence

wc -l docs/progress/MASTER.md
# 119 docs/progress/MASTER.md

git diff --check
# clean

Docs-only change; owned file: docs/progress/MASTER.md.

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📥 Commits

Reviewing files that changed from the base of the PR and between c86b74c and 4c2ee1c.

📒 Files selected for processing (1)

• docs/progress/MASTER.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/876-master-p44

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