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1155310d9a
Unify commit/rollback and terminal ack under a single first-terminal-wins gate. Previously the two blocks ran independently: the commit/rollback block executed for every same-gen return while only the ack block was gated on last_acked_effort_gen, producing order-dependent pool state. New semantics: the first same-gen return whose result is terminal (Applied / Failed / Cleared) performs the commit-or-rollback AND emits the ack AND marks the generation resolved. Later same-gen returns touch neither state nor the ack stream — the Desktop-visible ack and the pool state it reflects are resolved atomically by the same return. V-3 discarded-failed special case: a second-returning Failed worker may carry desired_effort == pool.desired_effort (values match after the first worker Applied and committed). V-3's equality check would skip invalidation, but that worker's live session ran at DEFAULT effort — stale. Force-invalidate when a same-gen return is discarded and the worker's result was Failed, regardless of the value comparison. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>