Adds a new `streams.input<T>()` API that enables external callers to send
typed data into running tasks. Inside tasks, data is received via `.on()`,
`.once()`, and `.peek()` methods. Outside tasks, `.send(runId, data)` pushes
data through a new platform API route.
Architecture:
- All input streams for a run multiplex onto a single `__input` stream
- Worker demuxes by stream ID and routes to registered handlers
- Lazy stream creation on first `.send()` call
- New IPC message `INPUT_STREAM_CREATED` triggers worker tail connection
New files:
- packages/core/src/v3/inputStreams/ (manager, types, noop, singleton)
- apps/webapp/app/routes/realtime.v1.streams.$runId.input.$streamId.ts
- DB migration for hasInputStream field on TaskRun
https://claude.ai/code/session_01SJHJts7r2yAxmoKLLz8vpc
Claude
107589420c