fix: pin Poetry version to 2.2.1 for consistent lock file generation

Prevents version mismatch between local (2.2.1) and GitHub Actions (2.3.3) causing false-positive 'out of sync' errors.

Author: FirstUnicorn

.github/workflows/validate-dependencies.yml

@@ -18,7 +18,7 @@ jobs:
 
       - name: Install Poetry and dependencies
         run: |
-          pip install poetry toml
+          pip install poetry==2.2.1 toml
       
       # Option 1: Poetry lock file validation
       - name: Check pyproject.toml validity