Surface machine posture (hostname, hub reachability) in agent context (#780)

[aarontrowbridge]

Closes #780.

What

The extension now writes ~/.amico/ops/fleet/attach-state.json on every attach-state transition (atomic tmp+rename, single writer): hostname, mode, hub name/URL, reachability, RTT, last-ok, updated-at. The context plugin's fleet section reads that file (file reads only — no network) and renders an honest posture block: machine name, mode, hub identity + reachability, last-verified age (10-min TTL, stated in the rendered line). Falls back to the legacy role line when the file is absent; degraded-but-honest when stale or corrupt — never a false "healthy", never a crash. Standalone fallback time survives extension restarts.

Gates (director-run)

• pnpm --filter amicode test: 2198 passed / 30 skipped / 0 failed (full suite, own run)
• tsc --noEmit -p packages/extension: clean

Notes

• Hub-server machines intentionally keep the plain role line (no state file).
• Part of the 2026-09-03 handoff bundle (A of E); provenance: vault sessions/session-20260903-fleet-improvements-brainstorm.md §6.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 9861ac83-7b65-44f3-9fbe-8124a54a8b0a

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}