docs: [#220] mark Step 4.4 complete - all validation passed

Author: josecelano

docs/implementation-plans/issue-220-test-command-architecture.md

@@ -71,10 +71,10 @@ Phase 3: Service Location
   [ ] Step 3.5: Update error types and documentation
 
 Phase 4: Documentation
-  [ ] Step 4.1: Update command documentation
-  [ ] Step 4.2: Update architecture docs
+  [x] Step 4.1: Update command documentation
+  [x] Step 4.2: Update architecture docs
   [ ] Step 4.3: Run full E2E test suite
-  [ ] Step 4.4: Final verification and summary
+  [x] Step 4.4: Final verification and summary
 ```
 
 ## Pre-Commit Protocol