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-team/code-reviewer/scripts/pr_analyzer.py

@@ -455,7 +455,7 @@ def main():
         help="Base branch for comparison (default: main)"
     )
     parser.add_argument(
-        "--head", "-h",
+        "--head",
         default="HEAD",
         help="Head branch/commit for comparison (default: HEAD)"
     )