Adds regression coverage for BLOCKER-1 (dispatch timeout releases
reservation for next caller after stalled upstream) and BLOCKER-2
(post-dispatch error preserves the post-dispatch hold so an immediate
second caller observes the reservation and is gated).
Both tests subscribe-first on the promptAsync call count and assert
status transitions without sleep-based synchronization. dispatchTimeoutMs
is the system under test, so passing it explicitly as 1ms in those tests
is the SUT, not a sleep-as-synchronization (per test-discipline.md).
Closes BLOCKER-3 (dispatch timeout + post-dispatch coverage)
Co-authored-by: gate-tests (deep / gpt-5.3-codex high)
YeonGyu-Kim
f93d7297c8