Close

The review exposed one durable lesson. Preserve it through supported native memory:

## Expired checkout sessions return 409, not a 5xx

Verified by `test/integration/expired-session.test.ts` and
`npm run test:integration -- expired-session`.

Applies to: checkout session expiry.
Does not apply to: other checkout validation failures or non-checkout sessions.

Without native memory, use the project's issue, decision, test, or maintained documentation. Saving nothing is valid.

After the final consumer finishes, present one choice for the spec, review, and sidecars:

1. Delete: remove exhausted transient work.
2. Leave: keep files required by a known continuation.
3. Promote: sanitize and move durable project truth, repair references, and validate.

The picker may expose Other to split the files across those actions.

The human chooses. Silence is not Leave, and a forgotten directory is not a retention policy. Promotion never pushes or creates lifecycle state.

This run needed no task, inventory, or change plan. Structural work follows inventories and change plans.