feat: add one-command golden master regeneration script (#2475)

Adds scripts/dev/regenerate_golden_master.py that regenerates the
golden master settings snapshot in a single command, replacing the
previous 3-step process (delete → pytest → stage).

Updates the pre-commit hook message to reference the new script.

.pre-commit-hooks/check-golden-master-settings.py

@@ -39,13 +39,8 @@ def main():
             print(f"    - {f}")
     print()
     print("  To regenerate the golden master:")
-    print(f"    1. Delete {golden_master}")
-    print(
-        "    2. Run: python -m pytest tests/settings/"
-        "test_settings_defaults_integrity.py::TestDefaultsIntegrity"
-        "::test_golden_master -xvs"
-    )
-    print(f"    3. Stage the updated {golden_master}")
+    print("    1. Run: python scripts/dev/regenerate_golden_master.py")
+    print(f"    2. Stage the updated {golden_master}")
     return 1
 
 

scripts/dev/regenerate_golden_master.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+"""Regenerate the golden master settings snapshot.
+
+Usage:
+    python scripts/dev/regenerate_golden_master.py
+"""
+
+import json
+import sys
+from pathlib import Path
+
+# ---------------------------------------------------------------------------
+# Resolve paths
+# ---------------------------------------------------------------------------
+PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent
+SRC_DIR = PROJECT_ROOT / "src"
+GOLDEN_MASTER_PATH = (
+    PROJECT_ROOT / "tests" / "settings" / "golden_master_settings.json"
+)
+
+# Ensure the package is importable
+if str(SRC_DIR) not in sys.path:
+    sys.path.insert(0, str(SRC_DIR))
+
+
+def main() -> int:
+    from local_deep_research.settings.manager import SettingsManager
+
+    manager = SettingsManager(db_session=None)
+    defaults = manager.default_settings
+
+    current = {key: dict(defaults[key]) for key in sorted(defaults.keys())}
+    output = json.dumps(current, indent=2, sort_keys=True, default=str) + "\n"
+
+    GOLDEN_MASTER_PATH.write_text(output, encoding="utf-8")
+
+    print(f"Wrote {len(current)} settings to {GOLDEN_MASTER_PATH}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())