feat: add comprehensive CI/CD pipeline

Adds GitHub Actions workflows for CI, maintenance, and releases with multi-platform testing matrix.

commitlint.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+  rules: {
+    'type-enum': [2, 'always', [
+      'feat', 'fix', 'docs', 'style', 'refactor',
+      'perf', 'test', 'chore', 'ci', 'build', 'revert'
+    ]],
+    'subject-case': [2, 'never', ['sentence-case', 'start-case', 'pascal-case', 'upper-case']],
+    'header-max-length': [2, 'always', 100]
+  }
+};