Fix tool argument passing for flag-style arguments

- Change nargs="*" to REMAINDER for tool_args to stop argparse from
  intercepting --flag style arguments meant for the tool
- Add -- separator handling to distinguish cmdforge args from tool args
- Map flag names to variable names using tool argument definitions
- Update AI review subprocess calls to use -- separator

Fixes scrutiny-ai-review tool arguments not being passed correctly.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/cmdforge/registry/app.py

@@ -251,11 +251,11 @@ def run_ai_scrutiny_review(scrutiny_report: dict, config: dict, tool_name: str,
     if not cmdforge_exe:
         return None
 
-    # Run the tool
+    # Run the tool (use -- to separate cmdforge args from tool args)
     try:
         result = subprocess.run(
             [
-                cmdforge_exe, "run", "scrutiny-ai-review",
+                cmdforge_exe, "run", "scrutiny-ai-review", "--",
                 "--warnings", json.dumps(warnings),
                 "--tool-config", json.dumps(tool_config),
             ],