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)

test_security.py

@@ -263,8 +263,8 @@ commands:
             print(f"         Got: {config}")
             failed += 1
 
-        # Test 4: Over limit (50 commands)
-        commands = [f"  - name: cmd{i}\n    description: Command {i}" for i in range(51)]
+        # Test 4: Over limit (100 commands)
+        commands = [f"  - name: cmd{i}\n    description: Command {i}" for i in range(101)]
         config_path.write_text("version: 1\ncommands:\n" + "\n".join(commands))
         config = load_project_commands(project_dir)
         if config is None: