feat: add comprehensive CI/CD pipeline

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

scripts/ci/validate-skills.js

@@ -0,0 +1,47 @@
+#!/usr/bin/env node
+/**
+ * Validate skill directories have SKILL.md with required structure
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+const SKILLS_DIR = path.join(__dirname, '../../skills');
+
+function validateSkills() {
+  if (!fs.existsSync(SKILLS_DIR)) {
+    console.log('No skills directory found, skipping validation');
+    process.exit(0);
+  }
+
+  const entries = fs.readdirSync(SKILLS_DIR, { withFileTypes: true });
+  const dirs = entries.filter(e => e.isDirectory()).map(e => e.name);
+  let hasErrors = false;
+  let validCount = 0;
+
+  for (const dir of dirs) {
+    const skillMd = path.join(SKILLS_DIR, dir, 'SKILL.md');
+    if (!fs.existsSync(skillMd)) {
+      console.error(`ERROR: ${dir}/ - Missing SKILL.md`);
+      hasErrors = true;
+      continue;
+    }
+
+    const content = fs.readFileSync(skillMd, 'utf-8');
+    if (content.trim().length === 0) {
+      console.error(`ERROR: ${dir}/SKILL.md - Empty file`);
+      hasErrors = true;
+      continue;
+    }
+
+    validCount++;
+  }
+
+  if (hasErrors) {
+    process.exit(1);
+  }
+
+  console.log(`Validated ${validCount} skill directories`);
+}
+
+validateSkills();