test: remove 169 change-detector tests across 21 files (#11472)

First pass of test-suite reduction to address flaky CI and bloat.

Removed tests that fall into these change-detector patterns:

1. Source-grep tests (tests/gateway/test_feishu.py, test_email.py): tests
   that call inspect.getsource() on production modules and grep for string
   literals. Break on any refactor/rename even when behavior is correct.

2. Platform enum tautologies (every gateway/test_X.py): assertions like
   `Platform.X.value == 'x'` duplicated across ~9 adapter test files.

3. Toolset/PLATFORM_HINTS/setup-wizard registry-presence checks: tests that
   only verify a key exists in a dict. Data-layout tests, not behavior.

4. Argparse wiring tests (test_argparse_flag_propagation, test_subparser_routing
   _fallback): tests that do parser.parse_args([...]) then assert args.field.
   Tests Python's argparse, not our code.

5. Pure dispatch tests (test_plugins_cmd.TestPluginsCommandDispatch): patch
   cmd_X, call plugins_command with matching action, assert mock called.
   Tests the if/elif chain, not behavior.

6. Kwarg-to-mock verification (test_auxiliary_client ~45 tests,
   test_web_tools_config, test_gemini_cloudcode, test_retaindb_plugin): tests
   that mock the external API client, call our function, and assert exact
   kwargs. Break on refactor even when behavior is preserved.

7. Schedule-internal "function-was-called" tests (acp/test_server scheduling
   tests): tests that patch own helper method, then assert it was called.

Kept behavioral tests throughout: error paths (pytest.raises), security
tests (path traversal, SSRF, redaction), message alternation invariants,
provider API format conversion, streaming logic, memory contract, real
config load/merge tests.

Net reduction: 169 tests removed. 38 empty classes cleaned up.

Collected before: 12,522 tests
Collected after:  12,353 tests

tests/hermes_cli/test_argparse_flag_propagation.py

@@ -57,85 +57,6 @@ def _build_parser():
     return parser
 
 
-class TestFlagBeforeSubcommand:
-    """Flags placed before 'chat' must propagate through."""
-
-    def test_yolo_before_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["--yolo", "chat"])
-        assert getattr(args, "yolo", False) is True
-
-    def test_worktree_before_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["-w", "chat"])
-        assert getattr(args, "worktree", False) is True
-
-    def test_skills_before_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["-s", "myskill", "chat"])
-        assert getattr(args, "skills", None) == ["myskill"]
-
-    def test_pass_session_id_before_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["--pass-session-id", "chat"])
-        assert getattr(args, "pass_session_id", False) is True
-
-    def test_resume_before_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["-r", "abc123", "chat"])
-        assert getattr(args, "resume", None) == "abc123"
-
-
-class TestFlagAfterSubcommand:
-    """Flags placed after 'chat' must still work."""
-
-    def test_yolo_after_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["chat", "--yolo"])
-        assert getattr(args, "yolo", False) is True
-
-    def test_worktree_after_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["chat", "-w"])
-        assert getattr(args, "worktree", False) is True
-
-    def test_skills_after_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["chat", "-s", "myskill"])
-        assert getattr(args, "skills", None) == ["myskill"]
-
-    def test_resume_after_chat(self):
-        parser = _build_parser()
-        args = parser.parse_args(["chat", "-r", "abc123"])
-        assert getattr(args, "resume", None) == "abc123"
-
-
-class TestNoSubcommandDefaults:
-    """When no subcommand is given, flags must work and defaults must hold."""
-
-    def test_yolo_no_subcommand(self):
-        parser = _build_parser()
-        args = parser.parse_args(["--yolo"])
-        assert args.yolo is True
-        assert args.command is None
-
-    def test_defaults_no_flags(self):
-        parser = _build_parser()
-        args = parser.parse_args([])
-        assert getattr(args, "yolo", False) is False
-        assert getattr(args, "worktree", False) is False
-        assert getattr(args, "skills", None) is None
-        assert getattr(args, "resume", None) is None
-
-    def test_defaults_chat_no_flags(self):
-        parser = _build_parser()
-        args = parser.parse_args(["chat"])
-        # With SUPPRESS, these fall through to parent defaults
-        assert getattr(args, "yolo", False) is False
-        assert getattr(args, "worktree", False) is False
-        assert getattr(args, "skills", None) is None
-
-
 class TestYoloEnvVar:
     """Verify --yolo sets HERMES_YOLO_MODE regardless of flag position.