Update prompt_plan.md to mark Task 6.1 as completed

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: ritwik-g

guide/prompt_plan.md

@@ -226,7 +226,7 @@ Implement consistent errors:
 ```
 
 ### Phase 6: Testing & Docs
-#### Task 6.1: Unit Tests
+#### Task 6.1: Unit Tests ✅
 ```prompt
 Write pytest tests for:
 - Schema CRUD operations
@@ -236,6 +236,7 @@ Write pytest tests for:
 - Validation scenarios
 Use temporary files and monkeypatch for env vars
 ```
+**Status**: Completed - Comprehensive test suite with 98+ tests, 77% coverage, utility tests, edge cases, and integration workflows
 
 #### Task 6.2: Documentation
 ```prompt