test(ai_client): rename send_result to send in 22 remaining test files

Batch rename of 22 test files. 62 references renamed total.

The full test suite is now GREEN again, matching the pre-rename baseline
from Task 1.1. Pure mechanical rename. No behavior change.

Files affected: test_ai_cache_tracking, test_ai_client_cli,
test_ai_client_result, test_api_events, test_context_pruner,
test_deepseek_provider, test_gemini_cli_* (3 files), test_gui2_mcp,
test_headless_* (2 files), test_live_gui_integration_v2,
test_orchestration_logic, test_phase6_engine, test_rag_integration,
test_run_worker_lifecycle_abort, test_spawn_interception_v2,
test_symbol_parsing, test_tier4_interceptor, test_tiered_aggregation,
test_token_usage.

Note: spec estimated 24 files; actual is 22 (test_deprecation_warnings
no longer exists, and 1 fewer file than spec's list).

Refs: conductor/tracks/send_result_to_send_20260616/

tests/test_run_worker_lifecycle_abort.py

@@ -13,8 +13,8 @@ class TestRunWorkerLifecycleAbort(unittest.TestCase):
      Test that run_worker_lifecycle returns early and marks ticket as 'killed'
      if the abort event is set for the ticket.
   """
-  # Mock ai_client.send_result
-  with patch('src.ai_client.send_result') as mock_send_result:
+  # Mock ai_client.send
+  with patch('src.ai_client.send') as mock_send:
    # Mock ticket and context
    ticket = Ticket(id="T-001", description="Test task")
    ticket = Ticket(id="T-001", description="Test task")
@@ -34,8 +34,8 @@ class TestRunWorkerLifecycleAbort(unittest.TestCase):
    # Assert ticket status is 'killed'
    self.assertEqual(ticket.status, "killed")
 
-   # Also assert ai_client.send_result was NOT called (abort fires before the call)
-   mock_send_result.assert_not_called()
+   # Also assert ai_client.send was NOT called (abort fires before the call)
+   mock_send.assert_not_called()
 
 if __name__ == "__main__":
  unittest.main()