feat(todo): carry the parallel-active count through ToolRow's summarySuffix

Rebuild the todo row's parallel summary on the shared ToolRow that master
introduced: planSummary still returns the active name and the remaining
count separately, and the row hands the count to a new non-shrinking
summarySuffix slot so a narrow row clips the summary text before the count.
An error row drops the suffix, whose collapsed summary is the failure line.

Re-record the ACP todo-write transcript for the parallel prompt, regenerate
the config catalog for the required allowParallelInProgress field, and
re-record the bilingual pairing hashes.

packages/client/ui-conversation/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-conversation/README.md
-README.md: 4869fa4df929027f031082deb04cc1ab3d18921c
-README.zh.md: 5c3091efa11b65f43ea5ea3037a60d0aa1bafbda
+README.md: 6a541f0599ef9c46a30df2d5a9d31e3dac96bdb1
+README.zh.md: 842c576f8396fef05ed45be4379ff04f90d448a0

packages/client/ui-conversation/tests/chat-tool-row.spec.tsx

@@ -301,6 +301,20 @@ describe('ToolRow', () => {
     expect(view.getByText('List files')).toBeTruthy()
   })
 
+  it('renders summarySuffix outside the ellipsized summary span, and drops it on a failure line', () => {
+    const view = render(<ToolRow {...rowProps} summarySuffix="+2" />)
+    const summary = view.getByText('List files')
+    const suffix = view.getByText('+2')
+    // Separate spans: .summary truncates, the suffix must not travel inside it.
+    expect(summary.contains(suffix)).toBe(false)
+    view.unmount()
+    // The failure line replaces the summary wholesale, so the suffix goes with it.
+    const failed = render(
+      <ToolRow {...rowProps} state="error" errorSummary="boom" summarySuffix="+2" />,
+    )
+    expect(failed.queryByText('+2')).toBeNull()
+  })
+
   it('an error file row drops the open-file link (the summary is failure prose, not the path)', () => {
     const open = vi.fn()
     const view = render(