fix: downgrade commitlint strict rules to warnings

- Move commitlint config from package.json to dedicated file
- Change subject-case and subject-full-stop rules from errors to warnings
- Eliminates red error messages on push while maintaining guidance
- Maintains conventional commit standards with non-blocking feedback
- Update BUILDING.md with comprehensive changelog entry

commitlint.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+  rules: {
+    // Downgrade strict case rules to warnings (level 1) instead of errors (level 2)
+    // This eliminates red error messages while maintaining helpful guidance
+    'subject-case': [1, 'never', ['sentence-case', 'start-case', 'pascal-case', 'upper-case']],
+    'subject-full-stop': [1, 'never', '.'],
+  }
+};