Operating merge trains on 2026-10-26 showed the gaps this closes. A dispatched
screen's verdict is read from the run's gate-binding and report-verdict artifacts
(lib/ship-queue-screen.ts) and recorded in the READY receipt: a RED screen refuses
ready under either choice and is never re-dispatched at the same merge SHA
(QUEUE_SCREEN_RED); a run that concluded success with no slice is NOT-RUN
(QUEUE_SCREEN_NOT_RUN), never followed, and counted as unscreened by train build.
When refs/pull/<n>/merge lags or is missing the screen is planned on a scratch merge
pushed as screen/<pr>-<head12> (#3465); QUEUE_SCREEN_STALE_REF means a real
conflict only. train watch --train is the resumable follow command; train prune
--stale settles a merging/green train whose PRs all merged or closed elsewhere;
train forget removes one record with an exact lease on refs/notes/gstack-trains;
verify --post-merge <sha> watches main's push workflows until they settle;
ready --dispatch-ci <wf,…> dispatches the free workflows on a conflicting PR,
waits, and clears the matching requires-remote pregate lanes with the run URLs;
train build --dry-run --stack-tests runs each PR's new test files on its integrated
prefix before anything is dispatched (QUEUE_TRAIN_STACK_RED).
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
