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]

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[aarontrowbridge]

Closing proactively: stale base (450 commits behind main) — the clobber class JJ's agent is repairing; merging would silently revert newer fixes on shared files. The branch is preserved; the work re-lands fresh off current main (#1465 slice doctrine) if still wanted. The fleet-boundary ADR's territory (#793) is meanwhile covered live by amicissimo PR #475 + the entitlement architecture in amicissimo #476.