- CHANGELOG: sprint 4 entry under [Unreleased] (covers all 9 US: dark mode, MITRE matrix overhaul, tactic_ids, done read-only + Reopen, engagement auto-status, UI polish, design-reviewer agent, PR helper, screenshots mandatory). Sprint 3 moved to its own [Sprint 3] section.
- README: status bump, test counts refreshed (193/92/158).
- tasks/lessons.md: 7 sprint-4 lessons captured (git status before sprint close, endpoint round-trip mismatch caught only by e2e, ink vs slab token split, structural row layout > class tweaks, hardcoded paths in migration tests, screenshots with auth, builder cross-context summaries as accidental re-dispatch).
- tasks/todo.md: status flipped to 🟢 SPRINT COMPLET, execution sequence ticks updated with commit hashes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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