test: update stale tests to match current code (#11963)

Seven test files were asserting against older function signatures and
behaviors. CI has been red on main because of accumulated test debt
from other PRs; this catches the tests up.

- tests/agent/test_subagent_progress.py: _build_child_progress_callback
  now takes (task_index, goal, parent_agent, task_count=1); update all
  call sites and rewrite tests that assumed the old 'batch-only' relay
  semantics (now relays per-tool AND flushes a summary at BATCH_SIZE).
  Renamed test_thinking_not_relayed_to_gateway → test_thinking_relayed_to_gateway
  since thinking IS now relayed as subagent.thinking.
- tests/tools/test_delegate.py: _build_child_agent now requires
  task_count; add task_count=1 to all 8 call sites.
- tests/cli/test_reasoning_command.py: AIAgent gained _stream_callback;
  stub it on the two test agent helpers that use spec=AIAgent / __new__.
- tests/hermes_cli/test_cmd_update.py: cmd_update now runs npm install
  in repo root + ui-tui/ + web/ and 'npm run build' in web/; assert
  all four subprocess calls in the expected order.
- tests/hermes_cli/test_model_validation.py: dissimilar unknown models
  now return accepted=False (previously True with warning); update
  both affected tests.
- tests/tools/test_registry.py: include feishu_doc_tool and
  feishu_drive_tool in the expected builtin tool set.
- tests/gateway/test_voice_command.py: missing-voice-deps message now
  suggests 'pip install PyNaCl' not 'hermes-agent[messaging]'.

411/411 pass locally across these 7 files.

tests/tools/test_delegate.py

@@ -274,6 +274,7 @@ class TestDelegateTask(unittest.TestCase):
                 model=None,
                 max_iterations=10,
                 parent_agent=parent,
+                task_count=1,
             )
 
         self.assertIs(mock_child._print_fn, sink)
@@ -294,6 +295,7 @@ class TestDelegateTask(unittest.TestCase):
                 model=None,
                 max_iterations=10,
                 parent_agent=parent,
+                task_count=1,
             )
 
         self.assertTrue(callable(mock_child.thinking_callback))
@@ -363,6 +365,7 @@ class TestToolNamePreservation(unittest.TestCase):
                     model=None,
                     max_iterations=10,
                     parent_agent=parent,
+                    task_count=1,
                 )
             except NameError as exc:
                 self.fail(
@@ -1000,6 +1003,7 @@ class TestChildCredentialPoolResolution(unittest.TestCase):
                 model=None,
                 max_iterations=10,
                 parent_agent=parent,
+                task_count=1,
             )
 
             self.assertEqual(mock_child._credential_pool, mock_pool)
@@ -1225,6 +1229,7 @@ class TestDelegationReasoningEffort(unittest.TestCase):
         _build_child_agent(
             task_index=0, goal="test", context=None, toolsets=None,
             model=None, max_iterations=50, parent_agent=parent,
+            task_count=1,
         )
         call_kwargs = MockAgent.call_args[1]
         self.assertEqual(call_kwargs["reasoning_config"], {"enabled": True, "effort": "xhigh"})
@@ -1241,6 +1246,7 @@ class TestDelegationReasoningEffort(unittest.TestCase):
         _build_child_agent(
             task_index=0, goal="test", context=None, toolsets=None,
             model=None, max_iterations=50, parent_agent=parent,
+            task_count=1,
         )
         call_kwargs = MockAgent.call_args[1]
         self.assertEqual(call_kwargs["reasoning_config"], {"enabled": True, "effort": "low"})
@@ -1257,6 +1263,7 @@ class TestDelegationReasoningEffort(unittest.TestCase):
         _build_child_agent(
             task_index=0, goal="test", context=None, toolsets=None,
             model=None, max_iterations=50, parent_agent=parent,
+            task_count=1,
         )
         call_kwargs = MockAgent.call_args[1]
         self.assertEqual(call_kwargs["reasoning_config"], {"enabled": False})
@@ -1273,6 +1280,7 @@ class TestDelegationReasoningEffort(unittest.TestCase):
         _build_child_agent(
             task_index=0, goal="test", context=None, toolsets=None,
             model=None, max_iterations=50, parent_agent=parent,
+            task_count=1,
         )
         call_kwargs = MockAgent.call_args[1]
         self.assertEqual(call_kwargs["reasoning_config"], {"enabled": True, "effort": "medium"})