- Fix spawn() zombie cell: clean up registry on start() failure
- Fix shutdown(): cancel + await tasks that exceed graceful timeout
- Fix _shutdown(): await mailbox.close() to release backend resources
- Fix escalate directive: stop failing child before propagating to grandparent
- Fix RedisMailbox.put(): wrap Redis errors in try/except, return False on failure
- Fix retry.py: replace assert with proper raise for last_exc
- Add put_batch() to Mailbox abstraction for single-roundtrip bulk enqueue
- Add RedisMailbox.put_batch() with atomic Lua script for bounded queues
- Add MailboxFullError exception type for semantic backpressure handling
- Add redis>=7.4.0 dependency with public PyPI sources in uv.lock
Tests added (31 total, up from 27):
- test_middleware_on_restart_hook: verifies middleware.on_restart() on supervision restart
- test_ask_propagates_actor_exception: ask() re-raises original exception type
- test_ask_propagates_exception_while_supervised: exception propagates; root actor survives
- test_ask_timeout_late_reply_no_exception: late reply after timeout is silent no-op
- test_actor_backpressure.py: MailboxFullError + dead letter on full mailbox
- test_actor_retry.py: ask_with_retry with exponential backoff
- test_mailbox_redis.py: RedisMailbox put/get/batch/close
- bench_actor_redis.py: RedisMailbox throughput benchmarks
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