Tasks with autoMerge explicitly enabled never auto-merged when the
project-level setting was disabled: the merge enqueue gate
(allowInReviewMergeProcessing) and all 19 in-review self-healing sweeps
checked only settings.autoMerge, and the board stall-signal hydration
passed the raw global into the diagnostic gates.
Introduce allowsAutoMergeProcessing(task, settings) in core — additive
relative to the global setting so configs with global auto-merge ON are
unchanged (explicit autoMerge:false tasks still flow to the merger's
manual-required parking) — and use it at the enqueue gate, every
self-healing sweep, and the store's stall/stalled signal contexts.
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