test_stable_release_graph and test_desktop_build_cache asserted gate text:
`== "always()"`, `== "false"`, `"conclusion != 'success'" in`,
`"!cancelled()" in`. Both files now evaluate the gate with the shared
evaluator, which also resolves `steps.*` now.
- The stable gates (acceptance, publication, complete) must run when every
ancestor failed.
- Deferred desktop e2e never runs.
- The publication reconciler runs after a failed, dispatched Stable Release
of this repository and on manual dispatch. It refuses a successful run, a
push-triggered run, and a fork's run.
- No desktop-build-cache step runs during cancellation. The service-failure
report runs when restore or save failed and stays quiet otherwise.
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