test(console): cover deployment disappearing before delete

[chalabi2]

The v0.1.3 release gate found three uncovered lines when a deployment disappears after an active GET preflight and DELETE returns 404. Existing tests returned 404 during preflight and never reached that branch.

Add a regression test asserting ErrAlreadyClosed, exactly one GET and DELETE, and exactly one failed close action-log entry. Document this existing behavior in DESIGN.md and SPEC.md and add the required changelog fragment. Runtime code is unchanged.

Validation:

• Console package tests and race check pass with release build tags.
• The previously uncovered block now has an execution count of 1, up from 0.
• The fresh coverage-reports artifact from CI run 36165345267 passes the full v0.1.2-to-HEAD changed-line gate: 100% of 603 executable lines, with no exceptions. This independently verifies the release coverage gap is closed.
• CI build, unit tests, race detection, offline E2E, fresh-chain E2E, lint, changelog, and changed-line coverage checks pass.
• Live Console lifecycle and live coverage report pass on retry of the same commit. The first attempt failed while reading provider logs after status and ingress passed; cleanup completed. The diagnostic suppressed the underlying error, so its exact cause is unconfirmed.
• Local changelog and whitespace checks pass.

After core-team review and merge, a separate generated changelog PR must merge before the unpublished v0.1.3 tag moves to repaired main and release publication is retried.

Failed release: https://github.com/akash-network/akt/actions/runs/36160047975