Fix documentation inconsistencies and bump document versions

Python/DESIGN_DOCUMENT_MODULE.md

@@ -1,6 +1,6 @@
 # Python Library Development Guidelines
 
-**Document Version:** v1
+**Document Version:** v2
 
 > **Note on Versioning:**
 > - This document version is independent — reused across projects
@@ -127,7 +127,6 @@ Define specific exception types in `src/<package>/exceptions.py`. Use a fail-fas
 - **pytest** only — no `unittest`, no `TestCase` classes, no `self.assert*`
 - Arrange-Act-Assert pattern
 - Test naming: `test_<action>_<context>`
-- Do not commit `poetry.lock` — this is a library; consumers pin their own dependencies
 
 ---