feat: Universal Agent API Bridge & Modular Skill Engine Overhaul

- Add Gitea/Vikunja API sync scripts to eliminate prompt-pollution.
- Move submodules to .agent/vendor for proper CLI encapsulation.
- Implement extract_skills.js to dynamically flatten 19 active skills.
- Translate CLI skill descriptions to Korean.
- Mask .env.agent in .gitignore ensuring true Zero-Pollution secure template.

.agent/scripts/sync_wiki.js

@@ -0,0 +1,77 @@
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+
+// 1. Load configuration from .env.agent
+const envPath = path.join(__dirname, '../config/.env.agent');
+if (!fs.existsSync(envPath)) {
+    console.error("Error: .agent/config/.env.agent file not found. Please create it from the template.");
+    process.exit(1);
+}
+
+const envContent = fs.readFileSync(envPath, 'utf8');
+const env = {};
+envContent.split('\n').forEach(line => {
+    // Basic dotenv parser supporting basic key="value" formats
+    const match = line.match(/^([^#=]+)="?(.*?)"?$/);
+    if (match) {
+        env[match[1].trim()] = match[2].trim();
+    }
+});
+
+// 2. Resolve Wiki URL (handle simple interpolations)
+let wikiUrl = env.WIKI_REPO_URL;
+if (!wikiUrl) {
+    console.error("Error: WIKI_REPO_URL is not defined in .env.agent.");
+    process.exit(1);
+}
+
+if (wikiUrl.includes('${GITEA_USERNAME}')) {
+    wikiUrl = wikiUrl.replace('${GITEA_USERNAME}', env.GITEA_USERNAME || '');
+}
+if (wikiUrl.includes('${GITEA_API_TOKEN}')) {
+    wikiUrl = wikiUrl.replace('${GITEA_API_TOKEN}', env.GITEA_API_TOKEN || '');
+}
+
+if (wikiUrl.includes('[YOUR_')) {
+    console.error("Warning: WIKI_REPO_URL looks like it contains placeholder tags ([YOUR_...]). Ensure the config is set up correctly.");
+    // We let it proceed in case it's a test environment with dummy tags
+}
+
+// 3. Execute Git commands in the Wiki directory
+const wikiDir = path.join(__dirname, '../../.knowledge/project_wiki');
+
+if (!fs.existsSync(path.join(wikiDir, '.git'))) {
+    console.error(`Error: .git repository not found inside ${wikiDir}. Wiki must be initialized via git first.`);
+    process.exit(1);
+}
+
+try {
+    console.log("Adding Wiki changes...");
+    execSync('git add .', { cwd: wikiDir, stdio: 'inherit' });
+    
+    // Check if there are changes to commit
+    const status = execSync('git status --porcelain', { cwd: wikiDir }).toString();
+    if (status.trim().length > 0) {
+        console.log("Committing changes...");
+        execSync('git commit -m "docs(agent): Auto-sync Wiki from Antigravity Agent"', { cwd: wikiDir, stdio: 'inherit' });
+    } else {
+        console.log("No changes to commit in Wiki.");
+    }
+
+    console.log("Pushing to Gitea Wiki repository...");
+    // WARNING: Output masking is not actively done here; this relies on the underlying tool to obscure tokens if echoed,
+    // but execSync with 'inherit' might leak the URL if git fails. We mask it manually for display, but git handles the URL internally.
+    execSync(`git push "${wikiUrl}" main`, { cwd: wikiDir, stdio: 'pipe' }); 
+    console.log("✅ Wiki synchronization completed successfully.");
+} catch (e) {
+    console.error("❌ Failed to sync wiki.");
+    // Mask API tokens in error messages
+    const errorMessage = e.message.replace(new RegExp(env.GITEA_API_TOKEN || 'dummy', 'g'), '********');
+    console.error(errorMessage);
+    if (e.stderr) {
+        const stderrStr = e.stderr.toString().replace(new RegExp(env.GITEA_API_TOKEN || 'dummy', 'g'), '********');
+        console.error(stderrStr);
+    }
+    process.exit(1);
+}