- README "Status" bumped to sprint 6 + test counts (253 backend, 136
frontend, 223 e2e).
- CHANGELOG [Unreleased] section for sprint 6: backend, frontend, e2e,
security, and changed-section notes (SPEC commit-first + mimic team).
- 6 sprint-6 lessons in tasks/lessons.md:
1. SPEC.md commit-first tamed the 4-sprint recurrence
2. Persistent team mimic + idle members > "never idle"
3. Security plugin caught CSV formula injection mid-sprint
4. Stdlib first before custom helpers
5. Tests that mock at module level can't exercise the target's branches
6. _engagement param for signature symmetry across render trio
This is the team-lead wrap-up commit. PR body in tasks/pr-body-sprint-6.md
will be ingested by make open-pr.