v0.6.8: ship notes (docs/versions/v0-6-8/README.md)

[firstintent]

Summary

V0.6.8 version-archive entry covering the two P0 ship-blocker patches landing in parallel PRs:

• Fan-out (F175/F176/F177): chat-squad mode forwarding the same Telegram reply from all 3 bots — root cause is the tail loop using `discover_active_session` instead of a deterministic per-bot marker. Three-layer fix: tmux env injection so the hook can derive role, hook persists Anthropic session_id to a marker file, tail reads the marker and targets one jsonl.
• chat_handle (F180-F184): SKILL described scientist nicknames (`@curie`) but `build_handle_map` used `role`. Schema adds `AgentSpec.chat_handle`, `BotRegistration.chat_handle`, `build_handle_map` falls back; cross-slug collision resolves to `@`; auto-mint via existing `agent_naming::pick_nickname` pool; unknown-handle reply lists per-chat available bots; `@ccteam list bots` admin keyword added.
• Polish (F178/F179): `install.sh` short-circuits on already-installed match + daemon-running warning (no uninstall path); drops one broken SKILL reference (`ccteam internal daemon ensure-running` — command doesn't exist).
• chore: clear `TODO(V0.7-chat-handle)` anchor, no_silent_todo_test count 6→5, dev-coupling-audit chat_handle row moved to V0.6.8-closed.

Test plan

• Implementation PRs (3 parallel) merged first; this docs PR can land in any order — it has no code dependency
• After all four merge: workspace version bump 0.6.7 → 0.6.8 in a follow-up commit + tag push
• User acceptance per §7 of the ship notes:
  • reno-squad group @ one bot → only that bot replies (other 2 silent)
  • `@curie hello` default handle works
  • `@unknownname hello` → group receives helpful list

This PR is doc-only and does NOT bump the workspace version. The bump goes in a final cleanup commit once the three implementation PRs land.