Refresh launch docs that still describe pre-Discussions / pre-Zendesk state #17

Task

Historical launch docs still disagree with current main.

Files

• docs/launch/LAUNCH-CHECKLIST.md — check off GitHub Discussions; replace stale pytest/coverage numbers with a pointer to docs/project-metrics.md
• docs/launch/LAUNCH-READINESS-REVIEW.md — v1.1 still says Zendesk not started and httpOnly cookies pending; both shipped

Keep the “historical snapshot” framing. Do not pretend old scores are current.

Acceptance criteria

• Discussions item checked or marked shipped via docs: enable GitHub Discussions with pilot Q&A template #11
• Zendesk/cookie lines match docs/ROADMAP.md and docs/release/known-limitations.md
• Test counts are not invented; link project-metrics