feat: increase command limit to 100 and add optimization guide

Changes:
- Increase command limit from 50 to 100 per project
- Add examples/OPTIMIZE_CONFIG.md with optimization strategies
- Update all documentation references (50 → 100)
- Update tests for new limit

Rationale:
- 50 was too restrictive for projects with many tools (Flutter, etc.)
- Users were unknowingly exceeding limit by listing subcommands
- 100 provides headroom while maintaining security
- New guide teaches wildcard optimization (flutter* vs listing each subcommand)

UI feedback idea: Show command count and optimization suggestions
(tracked for Phase 3 or future enhancement)

security.py

@@ -491,8 +491,8 @@ def load_project_commands(project_dir: Path) -> Optional[dict]:
         if not isinstance(commands, list):
             return None
 
-        # Enforce 50 command limit
-        if len(commands) > 50:
+        # Enforce 100 command limit
+        if len(commands) > 100:
             return None
 
         # Validate each command entry