fix: remove synthetic agent status fallback

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

BACKEND_UI_CHANGES.md

@@ -87,7 +87,7 @@ The Electron main process maps this to a `SessionEventRecord` with `kind: 'agent
 - "Code Reviewer is using read_file…"
 - "Handing off to Summarizer…"
 
-The activity panel in `ChatPane.tsx` is now wired to this data, showing every agent in the pattern with a current status such as waiting, thinking, tool usage, handoff, or completed.
+The activity panel in `ChatPane.tsx` is now wired to this data, showing every agent in the pattern with observed activity such as thinking, tool usage, handoff, or completed. If no event has been observed for an agent yet, the UI now states that no status has been reported instead of inventing a synthetic state.
 
 ## Files involved
 

src/renderer/components/ChatPane.tsx

@@ -37,8 +37,8 @@ export function ChatPane({ activity, project, pattern, session, onSend }: ChatPa
 
   const isBusy = session.status === 'running';
   const activityRows = useMemo(
-    () => buildAgentActivityRows(activity, pattern.agents, isBusy),
-    [activity, isBusy, pattern.agents],
+    () => buildAgentActivityRows(activity, pattern.agents),
+    [activity, pattern.agents],
   );
 
   useEffect(() => {

src/renderer/lib/sessionActivity.ts

@@ -77,11 +77,8 @@ export function pruneSessionActivities(
 export function buildAgentActivityRows(
   current: SessionActivityState | undefined,
   agents: PatternDefinition['agents'],
-  isBusy: boolean,
 ): AgentActivityRow[] {
-  const hasReportedActivity = !!current && Object.keys(current).length > 0;
-
-  return agents.map((agent, index) => {
+  return agents.map((agent) => {
     const activity = current?.[agent.id] ?? current?.[agent.name];
 
     if (activity) {
@@ -92,18 +89,6 @@ export function buildAgentActivityRows(
       };
     }
 
-    if (!hasReportedActivity && isBusy && index === 0) {
-      return {
-        key: agent.id,
-        agentName: agent.name,
-        activity: {
-          agentId: agent.id,
-          agentName: agent.name,
-          activityType: 'thinking',
-        },
-      };
-    }
-
     return {
       key: agent.id,
       agentName: agent.name,
@@ -113,7 +98,7 @@ export function buildAgentActivityRows(
 
 export function formatAgentActivityLabel(activity: AgentActivityState | undefined): string {
   if (!activity) {
-    return 'Waiting…';
+    return 'No status yet';
   }
 
   switch (activity?.activityType) {
@@ -126,7 +111,7 @@ export function formatAgentActivityLabel(activity: AgentActivityState | undefine
     case 'thinking':
       return 'Thinking…';
     default:
-      return 'Waiting…';
+      return 'No status yet';
   }
 }
 

tests/renderer/sessionActivity.test.ts

@@ -125,15 +125,10 @@ describe('session activity helpers', () => {
   });
 
   test('builds rows for all agents with sensible defaults', () => {
-    expect(buildAgentActivityRows(undefined, agents, true)).toEqual([
+    expect(buildAgentActivityRows(undefined, agents)).toEqual([
       {
         key: 'architect',
         agentName: 'Architect',
-        activity: {
-          agentId: 'architect',
-          agentName: 'Architect',
-          activityType: 'thinking',
-        },
       },
       {
         key: 'reviewer',
@@ -157,7 +152,6 @@ describe('session activity helpers', () => {
           },
         },
         agents,
-        true,
       ),
     ).toEqual([
       {
@@ -183,7 +177,7 @@ describe('session activity helpers', () => {
   });
 
   test('formats contextual activity labels and state flags', () => {
-    expect(formatAgentActivityLabel(undefined)).toBe('Waiting…');
+    expect(formatAgentActivityLabel(undefined)).toBe('No status yet');
     expect(
       formatAgentActivityLabel({
         agentId: 'reviewer',