Merge branch 'sidecars-claude' into sidecars

src/workspaces/officerdev/src/hooks/useChat.ts

@@ -141,6 +141,20 @@ export function useChat(initialSessionId?: string, initialModel?: string | null,
   function handleMessage(data: unknown) {
     const msg = data as ServerMessage;
 
+    // Continuity check, before the cursor moves. The writer stamps every durable message with the cursor
+    // of the one before it in the same session, so a mismatch against what we last saw means something is
+    // missing — pruned by retention, or a write that failed. Surface it: a conversation that silently
+    // skips a tool call or half an answer reads as the assistant having done something inexplicable.
+    // Only checked once we actually hold a cursor; opening a session from history starts mid-chain by
+    // design (events are swept after 7 days, the transcript itself is not).
+    const prevSeq = (data as { prevSeq?: number }).prevSeq;
+    if (typeof prevSeq === 'number' && cursorRef.current > 0 && prevSeq !== cursorRef.current) {
+      setMessages((prev) => [
+        ...prev,
+        { role: 'error', text: '⚠️ Some output could not be recovered — part of this conversation is missing above.' },
+      ]);
+    }
+
     // Advance the resume cursor for any durable (seq-carrying) event.
     const seq = (data as { seq?: number }).seq;
     if (typeof seq === 'number' && seq > cursorRef.current) cursorRef.current = seq;