Removes the dashboard's stuck-task tagging per operator request: the Stuck
card/status badges, stuck row styling, the footer Stuck segment and
stuckTaskCount stat, utils/taskStuck.ts, the isStuck agent-activity gate,
and the taskStuckTimeoutMs prop plumbing (App -> Board/Lane/Column/
WorktreeGroup/MainContent -> TaskCard/ListView/ExecutorStatusBar). Stuck-task
tests are deleted or reconciled. The taskStuckTimeoutMs setting and the
engine's recovery sweeps (including the stuck-killed status) are unchanged —
the setting is engine-side only now.
Also repoints the FN-6756 liveness-gate ratchet's facade scans at
executor/task-executor-session-facades.ts, where the wave20 extraction moved
hasLiveSessionSurface/clearPhantomExecutorBinding (the two pre-existing red
tests on main).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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