fix: clear stale workspace activity

src/server/activity/workspaceActivityService.test.ts

@@ -32,6 +32,47 @@ describe("WorkspaceActivityService", () => {
     expect(events.at(-1)).toMatchObject({ type: "workspace.activity", activity: { cwd: "/repo", hasSessionActivity: false, hasTerminalActivity: false } });
   });
 
+  it("clears stale active activity when an idle status arrives", () => {
+    const events: RealtimeEvent[] = [];
+    const service = new WorkspaceActivityService({ publishRealtime: (event) => events.push(event) });
+
+    service.applySessionActivity("/repo", { sessionId: "s1", phase: "active", label: "running tool", detail: "read", at: "now" });
+    service.applySessionStatus("/repo", status({ isStreaming: false }));
+
+    expect(service.snapshot().workspaces).toEqual([]);
+    expect(events.at(-1)).toMatchObject({ type: "workspace.activity", activity: { cwd: "/repo", hasSessionActivity: false, hasTerminalActivity: false } });
+  });
+
+  it("publishes a clear event when removing an already-pruned session with a cwd", () => {
+    const events: RealtimeEvent[] = [];
+    const service = new WorkspaceActivityService({ publishRealtime: (event) => events.push(event) });
+
+    service.removeSession("missing-session", "/repo");
+
+    expect(events.at(-1)).toMatchObject({ type: "workspace.activity", activity: { cwd: "/repo", hasSessionActivity: false, hasTerminalActivity: false } });
+  });
+
+  it("reconciles stale session activity for a workspace", () => {
+    const events: RealtimeEvent[] = [];
+    const service = new WorkspaceActivityService({ publishRealtime: (event) => events.push(event) });
+
+    service.applySessionActivity("/repo", { sessionId: "s1", phase: "active", label: "running tool", at: "now" });
+    service.applySessionActivity("/repo", { sessionId: "s2", phase: "active", label: "running tool", at: "now" });
+    service.applySessionActivity("/other", { sessionId: "s3", phase: "active", label: "running tool", at: "now" });
+
+    service.reconcileSessionActivity("/repo", ["s2"]);
+
+    expect(service.snapshot().workspaces).toMatchObject([
+      { cwd: "/other", hasSessionActivity: true, hasTerminalActivity: false },
+      { cwd: "/repo", hasSessionActivity: true, hasTerminalActivity: false },
+    ]);
+
+    service.reconcileSessionActivity("/repo", []);
+
+    expect(service.snapshot().workspaces).toMatchObject([{ cwd: "/other", hasSessionActivity: true, hasTerminalActivity: false }]);
+    expect(events.at(-1)).toMatchObject({ type: "workspace.activity", activity: { cwd: "/repo", hasSessionActivity: false, hasTerminalActivity: false } });
+  });
+
   it("combines sessions and terminals and clears closed terminals", () => {
     const events: RealtimeEvent[] = [];
     const service = new WorkspaceActivityService({ publishRealtime: (event) => events.push(event) });