fix(eve): prioritize current hook deliveries over stale backlog

[iroiro147]

Supersedes #598. Rebuilt on current main (46c6ce3); the old branch had diverged with no shared merge-base, so this is a fresh rebased replacement carrying the identical fix.

What changed

Prioritize current hook deliveries over a stale backlog: workflow-entry.ts now buffers per-session hook deliveries via a DeliveryBuffers model so the most recent delivery wins and superseded turns are dropped instead of replayed LIFO. This was a semantic merge, not a textual one — the cherry-pick reconciled the PR's DeliveryBuffers model with all upstream-newer behavior (session-timeout via consumeSessionTimeout/DEFAULT_SESSION_TIMEOUT_MS, cancellation via settleCancelledTurnStep/cancelDescendantTurnsStep, DurableCompiledArtifactsSource, deferred DispatchedTurn disposal, runTurn). session-delivery-hook.ts re-added consumeSessionTimeout() so session-timeout detection and the new current/replaced prioritization coexist.

Test evidence

Suite	Result
pnpm --filter eve typecheck	exit 0
unit src/execution + src/internal	131 files / 1127 tests PASS
unit workflow-entry / session-delivery-hook / turn-control-receiver / turn-dispatch	4 files / 39 tests PASS
integration session-delivery-hook.integration	2 tests PASS
lint (oxlint changed src files)	clean
full-eve unit suite	535 files / 5651 passed (+1 skipped)

Env-only note: test/bin-bootstrap.test.ts (4 failures) fails only because the sandbox Node is v22.22.3 < the >=24 required by bin/eve.js. This is pre-existing and path-disjoint from this PR (bin/eve.js untouched).

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