Fix documentation inconsistencies and bump document versions

Claude/skills/commit/SKILL.md

@@ -1,6 +1,8 @@
 ---
 name: commit
 description: Updates changelog and proposes a concise verbal git commit message
+metadata:
+  version: v2
 ---
 
 1. Run the changelog skill: read git log and staged changes, then update CHANGELOG.md accordingly (same as /changelog).
@@ -9,4 +11,5 @@ description: Updates changelog and proposes a concise verbal git commit message
    - Concise, verbal style — e.g. "Add X", "Fix Y", "Refactor Z"
    - NOT filename-style — never "update_something.py" or "changes to foo"
    - In English
+   - **No AI authorship** — never append `Co-Authored-By: Claude`, a "Generated with …" line, or any tool signature or emoji footer. The same applies to pull request descriptions.
    - Do NOT run git commit — only propose the message and wait for user confirmation.