Merge hook test files into single test_hooks.py

Consolidate test_hooks_json_format.py and test_hook_wrappers.py into a
single test_hooks.py file with logical organization:

- TestClaudeHookWrapper / TestGeminiHookWrapper: Platform wrapper scripts
- TestRulesStopHook / TestUserPromptSubmitHook: Rules-specific hooks
- TestHooksWithTranscript: Transcript input handling
- TestHookExitCodes: Exit code contract tests (DO NOT EDIT)
- TestHookWrapperIntegration: Integration tests with Python hooks
- TestRulesCheckModule: Python module tests

Also moved hooks_dir and src_dir fixtures to conftest.py for sharing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: nhorton

tests/shell_script_tests/conftest.py

@@ -68,6 +68,18 @@ def rules_hooks_dir() -> Path:
     )
 
 
+@pytest.fixture
+def hooks_dir() -> Path:
+    """Return the path to the main hooks directory (platform wrappers)."""
+    return Path(__file__).parent.parent.parent / "src" / "deepwork" / "hooks"
+
+
+@pytest.fixture
+def src_dir() -> Path:
+    """Return the path to the src directory for PYTHONPATH."""
+    return Path(__file__).parent.parent.parent / "src"
+
+
 @pytest.fixture
 def jobs_scripts_dir() -> Path:
     """Return the path to the jobs scripts directory."""