P5.2 + P5.3: Bootstrap docs, README, and RUNBOOK
- docs/bootstrap.md: step-by-step bootstrap procedure with lessons
learned from the first deployment (NixOS sandbox issues, podman
rootless setup, container naming, MCR auth workaround)
- README.md: quick-start guide, command reference, doc links
- RUNBOOK.md: operational procedures for operators (health checks,
common operations, unsealing metacrypt, cert renewal, incident
response, disaster recovery, file locations)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>