feat(chat): multi-client live view — watch in-flight turns + user prompt on stream

- subscribe every open conversation on load + WS reconnect (resync), unsubscribe on tab close
- derive a stream-based 'generating' state for watchers (Composer running indicator)
- fold the user-message turn event so watchers render the prompt mid-turn (de-dup vs sender's optimistic echo)
- re-pin [email protected] / [email protected]; re-mirror contracts; add user-message to the exhaustiveness guard

1 files changed, 8 insertions, 2 deletions

diff --git a/src/core/chunks/index.ts b/src/core/chunks/index.ts
index 0718c0d..ecfee74 100644
--- a/src/core/chunks/index.ts
+++ b/src/core/chunks/index.ts
@@ -1,7 +1,13 @@
 export type { RenderGroup, ToolBatchEntry } from "./groups";
 export { groupRenderedChunks } from "./groups";
-export { appendUserMessage, applyHistory, foldEvent, initialState } from "./reducer";
-export { selectChunks, selectMessages } from "./selectors";
+export {
+	appendUserMessage,
+	applyHistory,
+	clearGenerating,
+	foldEvent,
+	initialState,
+} from "./reducer";
+export { selectChunks, selectGenerating, selectMessages } from "./selectors";
 export type {
 	AccumulatingChunk,
 	ProvisionalChunk,