- Restored per-provider stream watchdog with idle and first-event timeout support, progress-event filtering, and per-provider timeout overrides via `getStreamIdleTimeoutMs()` and `getStreamFirstEventTimeoutMs()`.
- Fixed silent multi-hour hangs on Codex WebSocket and z.ai/GLM-via-OpenRouter subagent runs by filtering keepalive frames from idle watchdog resets.
- Added `isOpenAICompletionsProgressChunk` export and progress-event filtering to multiple providers (Anthropic, OpenAI Responses/Completions, Azure OpenAI, Codex) to prevent keepalive frames from resetting idle timeouts.
- Un-deprecated `StreamOptions.streamIdleTimeoutMs` and wired it into all built-in providers and lazy stream forwarder with environment variable fallback support.
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