Add support for streaming responses when dirty app actions return
generators (sync or async). This enables real-time delivery of
incremental results for use cases like LLM token generation.
Features:
- Streaming protocol with chunk/end/error message types
- Worker support for sync and async generators
- Arbiter forwarding of streaming messages
- Deadline-based timeout handling
- Async client streaming API
Protocol:
- Chunk messages (type: "chunk") contain partial data
- End messages (type: "end") signal stream completion
- Error messages can occur mid-stream
New files:
- benchmarks/dirty_streaming.py: Streaming benchmark suite
- tests/dirty/test_*_streaming*.py: Streaming test coverage
- docs/content/dirty.md: Streaming documentation with examples
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