fix: repair 25 Python scripts failing --help across all domains

- Fix Python 3.10+ syntax (float | None → Optional[float]) in 2 scripts
- Add argparse CLI handling to 9 marketing scripts using raw sys.argv
- Fix 10 scripts crashing at module level (wrap in __main__, add argparse)
- Make yaml/prefect/mcp imports conditional with stdlib fallbacks (4 scripts)
- Fix f-string backslash syntax in project_bootstrapper.py
- Fix -h flag conflict in pr_analyzer.py
- Fix tech-debt.md description (score → prioritize)

All 237 scripts now pass python3 --help verification.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

engineering/skill-tester/scripts/skill_validator.py

@@ -19,7 +19,22 @@ import ast
 import json
 import re
 import sys
-import yaml
+try:
+    import yaml
+except ImportError:
+    # Minimal YAML subset: parse simple key: value frontmatter without pyyaml
+    class _YamlStub:
+        class YAMLError(Exception):
+            pass
+        @staticmethod
+        def safe_load(text):
+            result = {}
+            for line in text.strip().splitlines():
+                if ':' in line:
+                    key, _, value = line.partition(':')
+                    result[key.strip()] = value.strip()
+            return result if result else None
+    yaml = _YamlStub()
 import datetime as dt
 from pathlib import Path
 from typing import Dict, List, Any, Optional, Tuple