Run hooks already exposed OnRunRestore for the read side of a
suspend/restore cycle. The write side -- every coreLoop or restore
call that persists a checkpoint to the Checkpointer -- had no
corresponding hook, so callers wanting to record metrics, audit
events, or trigger external state transitions on every snapshot had
no insertion point.
Add OnRunSnapshot to RunHooks and emit it after each successful
Checkpointer.Save: the suspend, awaiting-approval, nested-approval,
post-tool-turn, and restore-progress sites. The hook fires only on
durable saves; save failures still log and skip the hook so observers
never see a checkpoint that did not land.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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