fix: sweep completed Pi agent row when its terminal tab is closed

A 'done' Pi agent entry lingers in agentStatusByPaneKey after its
terminal tab is closed: its paneKey's tabId no longer matches any open
tab, so dropAgentStatusByTabPrefix never sweeps it. The sidebar selector
getLiveEntriesByWorktree used an unconditional fallback
(tabIdToWorktreeId.get(parsed.tabId) ?? entry.worktreeId), added in
#4371 to surface early child-agent rows before their tab reaches the
renderer. That fallback re-attributed the orphaned 'done' entry to the
worktree, so buildWorktreeAgentRows rendered it as a stale live 'Done'
row forever (Codex/Claude tear down cleanly because their pane/tab
keying matches the closed tab).

Restrict the worktree-attribution fallback to non-'done' entries so
completed rows whose tab is gone are dropped, while still surfacing
active child rows whose tab has not yet reached the renderer.

Supersedes #5914 (adopted and re-verified).

Fixes #5913

Co-authored-by: Alberto Cuervo <Br1NKOL@users.noreply.github.com>

src/renderer/src/components/sidebar/worktree-agent-row-selectors.test.ts

@@ -150,6 +150,27 @@ describe('selectLiveAgentStatusEntriesForWorktree', () => {
 
     expect(selectLiveAgentStatusEntriesForWorktree(state, 'wt-1')).toEqual([childEntry])
   })
+
+  it('does not use worktree attribution for a completed row whose tab is gone', () => {
+    const closedEntry = makeEntry(PANE_KEY_1, 1000, {
+      state: 'done',
+      worktreeId: 'wt-1',
+      tabId: 'tab-1',
+      agentType: 'pi'
+    })
+    const state = {
+      tabsByWorktree: {
+        'wt-1': [makeTab('tab-live')]
+      },
+      agentStatusByPaneKey: {
+        [PANE_KEY_1]: closedEntry
+      },
+      migrationUnsupportedByPtyId: {},
+      retainedAgentsByPaneKey: {}
+    }
+
+    expect(selectLiveAgentStatusEntriesForWorktree(state, 'wt-1')).toEqual([])
+  })
 })
 
 describe('selectRuntimeAgentOrchestrationForWorktree', () => {

src/renderer/src/components/sidebar/worktree-agent-row-selectors.ts

@@ -97,7 +97,9 @@ function getLiveEntriesByWorktree(state: WorktreeAgentRowsState): Map<string, Ag
     if (!parsed) {
       continue
     }
-    const worktreeId = tabIdToWorktreeId.get(parsed.tabId) ?? entry.worktreeId
+    const tabWorktreeId = tabIdToWorktreeId.get(parsed.tabId)
+    // Why: keep early attributed child rows, but hide completed rows once their tab is gone.
+    const worktreeId = tabWorktreeId ?? (entry.state === 'done' ? undefined : entry.worktreeId)
     if (!worktreeId) {
       continue
     }