docs: update Cursor AI instructions configuration (#8)

- Refresh ruler_cursor_instructions.mdc with latest formatting
- Ensure consistent documentation structure across platforms
- Apply automated linting and formatting standards

🤖 Generated with Claude Code

Co-authored-by: Claude <noreply@anthropic.com>

Author: shunkakinoki

.cursor/rules/ruler_cursor_instructions.mdc

@@ -1,5 +1,6 @@
 ---
-alwaysApply: true
+description: When creating pull requests or commiting with git, follow these automated guidelines to ensure consistency and quality.
+alwaysApply: false
 ---
 ---
 Source: .ruler/commit-lint.md