# Complete - m-iop-agent-cli-runtime/15+13_host_lifecycle

## Completion Time

2026-07-30

## Summary

Completed the standalone host lifecycle boundary after three implementation/review loops; final verdict: PASS.

## Loop History

| Plan | Review | Verdict | Notes |
|------|--------|---------|-------|
| `plan_local_G06_0.log` | `code_review_cloud_G06_0.log` | FAIL | The initial lifecycle implementation could deadlock because `Stop` waited for the lifecycle mutex before cancelling an in-progress `Start`. |
| `plan_local_G04_1.log` | `code_review_cloud_G04_1.log` | FAIL | Cancellation was fixed, but the regression did not observe terminal status while rollback cleanup was still blocked. |
| `plan_cloud_G03_2.log` | `code_review_cloud_G04_2.log` | PASS | A deterministic cleanup gate now proves `Status().Stopped` remains false until rollback cleanup completes. |

## Implementation/Cleanup

- Added ordered component startup, reverse teardown, rollback, retained lifecycle errors, defensive status snapshots, and idempotent stop behavior to the standalone host.
- Published concurrent stop cancellation before serialized teardown so an in-progress component start can terminate without deadlock.
- Added deterministic regression coverage for prompt cancellation, started-prefix rollback, cleanup-before-terminal ordering, error identity, exact trace order, and repeated stop.

## Final Verification

- `gofmt -d apps/agent/internal/host/*.go` - PASS; no formatting diff.
- `go test -count=20 -run '^TestHostStopCancelsInProgressStart$' ./apps/agent/internal/host` - PASS; `ok iop/apps/agent/internal/host 0.003s`.
- `go test -count=1 ./apps/agent/internal/host` - PASS; `ok iop/apps/agent/internal/host 0.002s`.
- `go test -count=1 -race ./apps/agent/internal/host` - PASS; `ok iop/apps/agent/internal/host 1.006s`.
- `go vet ./apps/agent/internal/host` - PASS; no diagnostics.
- `git diff --check` - PASS; no whitespace errors.

## Remaining Nits

- None.

## Follow-up Work

- None.
