docs(roadmap): add status snapshot + per-feature progress markers

[furukama]

Summary

After the merge wave of 2026-04-27/28 (F1–F5 foundations, R3 + 5 children, F6.1, F6.2, F8.1, F8.2, A2, A3, R1.1, R5.1, R21.1), the internal roadmap.md had no way to show what was done at a glance. This PR adds a status overlay — no scope or priority changes.

What changed

• Status snapshot section at the top with aggregate counts and the current critical-path picture (5/11 foundations, 1 P0 feature done, etc.)
• Status column on the main feature table:
  • ✅ Done (e.g. R3)
  • 🟡 N/M partial (e.g. R1 1/5, R5 1/6, R21 1/6)
  • 🔄 PR in flight (R8 feat: brand-voice + output classifier guard plugin #408, R9 feat: cross-instance peer delegation (hierarchical swarm) #409, R10 [codex] Trajectory capture from event bus #637, R23 feat: add hybridclaw backup and restore CLI #428)
  • ⬜ Not started
• Status prefixes on every Foundation and Cross-cutting bullet
• Roadmap rows added for items that had only been in the umbrella + GitHub issues, not on this table:
  • R22 — Async voice channel
  • R23 — Whole-instance backup + restore (disaster recovery)
• F11 Aux-LLM trace-judge framework added to Foundations list (filed retrospectively after R10.1 made traces real)

What did not change

• No scope changes
• No priority shifts
• No re-numbering of existing items
• Manifesto reference + naming convention unchanged
• "How to read this" / "Sequencing rules" / "Out of scope" sections unchanged

Test plan

• Confirm doc renders correctly under Overview at the URL
• Confirm Status column displays cleanly across the 22 feature rows
• Confirm aggregate counts in snapshot match the per-row markers (5/11 foundations done · 1 P0 feature ✅)

🤖 Generated with Claude Code