=== Simulated 429 on linear update --done --proof ===
STDOUT:
RUSH-DEMO -> queued for retry (rate limited / transient)

=== linear queue list ===
STDOUT:
1 close intent(s) queued:
  RUSH-DEMO -> Done (attempts=0)
Run `linear queue drain` to apply them.

=== linear queue drain --once (honors Retry-After: 12s) ===
STDOUT:
Retained RUSH-DEMO in queue (retry 1 in 12s)
Applied 0, 1 pending retry.

=== unittest ===
Ran 100 tests in 0.019s
OK