Threading refactor (5/7): Close ordering & shutdown hardening#5

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igorbernstein2 wants to merge 9 commits into

threading-refactor-phase-4from

threading-refactor-phase-5

Commits on Jun 29, 2026

fix: drain SessionPools before tearing down userCallbackExecutor on Client.close
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fix: deliver terminal onClose to Scheduled retries pending at Client.close
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fix: serialize open*/close so racing opens cannot create orphan pools
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fix: ShimImpl uses shutdownAndAwait for userCallbackExecutor
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fix: lift shim loader throws to failed futures via SessionPoolMap
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test: cover pool close while a vRPC is queued in pendingRpcs
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chore: record debug tag before throwing on unexpected drainedFuture failure
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Commits on Jun 30, 2026