Update CLAUDE.md to prohibit automated signatures in PRs

- Explicitly prohibit "Generated with Claude Code" in PR descriptions
- Extend existing commit message restrictions to pull requests
- Maintain consistency in automated signature policy

Author: mxpv

CLAUDE.md

@@ -96,9 +96,9 @@ The application uses TOML configuration files. See `config.toml.example` for all
 
 ### Git Workflow
 - Write short, expressive commit messages that clearly describe the change
-- Do not include automated signatures or generation notices in commit messages
-- Don't add "Generated with Claude Code" to commit messages
-- Don't add "Co-Authored-By: Claude noreply@anthropic.com" to commit messages
+- Do not include automated signatures or generation notices in commit messages or pull requests
+- Don't add "Generated with Claude Code" to commit messages or pull request descriptions
+- Don't add "Co-Authored-By: Claude noreply@anthropic.com" to commit messages or pull request descriptions
 - Keep commits focused and atomic - one logical change per commit
 - Ensure the build passes before pushing commits