Adds GET /api/workspaces/:id/acp/stream. Client opens a WebSocket,
sends {"type":"prompt","content":"..."}, and receives a stream of
{"type":"chunk","messageId","text"} events followed by exactly
one {"type":"complete","stopReason"} or {"type":"error","error"}.
Closing the WS early triggers session/cancel.
- internal/acp/messages.go: StreamEvent wire shape.
- internal/acp/client.go:
- streamChs []chan StreamEvent set; AddStream / RemoveStream.
- sendStream non-blocking fanout.
- Client.Stream(ctx, content, out) registers out, sends prompt,
emits complete/error after the prompt response, unregisters.
- handleNotification fans chunk events to all stream consumers.
- notifyWG ensures chunk ordering vs the terminal event.
- internal/acp/service.go: Service.Stream(workspaceID, content, out)
mirrors Prompt (per-workspace lock, 5-min timeout, EnsureReady).
- internal/service/acp_service.go: thin AcpService.Stream wrapper
that maps acp.StreamEvent -> model.AcpStreamEvent.
- internal/model/acp.go: AcpStreamRequest, AcpStreamEvent DTOs.
- internal/api/acp_handler.go: stream WS handler (upgrade, read
prompt, run Stream in a goroutine, write events, ping/pong, Cancel
on client close).
- internal/api/router.go: register the new route.
- internal/acp/transport.go: dispatch notifications synchronously
(vs. goroutine per notification) so chunks preserve order before
the session/prompt response.
- internal/acp/client_test.go: TestClientStreamEmitsChunkAndComplete
with a fake transport that drives a known sequence.
- internal/api/acp_handler_test.go: TestAcpStreamHandlerRoutes
smoke test using a fake opencode acp script.
Existing POST /api/workspaces/:id/acp/prompt is unchanged.
E2E: prompt 'say hi in exactly 3 words' -> 3 chunk events
('Hi',' there','!') + 1 complete {stopReason: 'end_turn'}.
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