fix(extension): UTF-8 encoding + noise filter enhancement (v0.5.39)

- http-bridge.ts: add req.setEncoding('utf8') to all POST handlers
  to fix Korean text corruption in pending/chat/dump payloads
- observer-script.ts: add inline pre-strip in cleanLines() for
  Material icon names concatenated by textContent without newlines
- observer-script.ts: apply cleanLines() to codeText extraction
- known-issues: document UTF-8 encoding and noise filter issues

scratch_patch_verify.js

@@ -0,0 +1,94 @@
+/**
+ * html-patcher 수정 검증 스크립트
+ * 실제 workbench.html + 실제 observer-script 출력물로 패치 시뮬레이션
+ */
+const fs = require('fs');
+const path = require('path');
+
+// 1. 실제 깨끗한 workbench.html 읽기
+const htmlPath = path.join(
+  process.env.LOCALAPPDATA,
+  'Programs', 'Antigravity', 'resources', 'app', 'out',
+  'vs', 'code', 'electron-browser', 'workbench', 'workbench.html'
+);
+let html = fs.readFileSync(htmlPath, 'utf8');
+console.log(`[1] Clean HTML: ${html.length} chars, ${html.split('\n').length} lines`);
+console.log(`    Has AG SDK: ${html.includes('AG SDK')}`);
+
+// 2. 실제 observer-script.ts의 출력 시뮬레이션 (generateApprovalObserverScript)
+const observerModule = require('./extension/out/observer-script');
+const observerJS = observerModule.generateApprovalObserverScript(34332);
+console.log(`[2] Observer JS: ${observerJS.length} chars`);
+console.log(`    Contains $': ${observerJS.includes("$'")}`);
+console.log(`    Contains ')$': ${observerJS.includes("')$")}`);
+
+// 3. 패치 시뮬레이션 — 수정 전 (BUG)
+const inlineBlock_buggy = `<!-- AG SDK INLINE [variet-gravity-bridge] -->\n<script>\n${observerJS}\n</script>\n<!-- /AG SDK INLINE [variet-gravity-bridge] -->`;
+let html_buggy = html.replace('</body>', `\n${inlineBlock_buggy}\n</body>`);
+
+// 4. 패치 시뮬레이션 — 수정 후 (FIX)
+const inlineBlock = `<!-- AG SDK INLINE [variet-gravity-bridge] -->\n<script>\n${observerJS}\n</script>\n<!-- /AG SDK INLINE [variet-gravity-bridge] -->`;
+const safeInlineBlock = inlineBlock.replace(/\$/g, '$$$$');
+let html_fixed = html.replace('</body>', `\n${safeInlineBlock}\n</body>`);
+
+console.log(`\n[3] BUGGY result: ${html_buggy.length} chars`);
+console.log(`[4] FIXED result: ${html_fixed.length} chars`);
+
+// 5. JS 코드 추출 및 SyntaxError 검증
+function extractAndCheckJS(patchedHtml, label) {
+  const match = patchedHtml.match(/<script>\n([\s\S]*?)\n<\/script>/);
+  if (!match) {
+    console.log(`[${label}] ERROR: <script> block not found!`);
+    return false;
+  }
+  const jsCode = match[1];
+  
+  // Check if original HTML structure leaked into JS
+  const hasStartupComment = jsCode.includes('<!-- Startup');
+  const hasWorkbenchJS = jsCode.includes('<script src="./workbench.js"');
+  const hasClosingHtml = jsCode.includes('</html>') && !jsCode.includes("'</html>'");
+  
+  console.log(`[${label}] JS code: ${jsCode.length} chars`);
+  console.log(`  Leaked <!-- Startup -->: ${hasStartupComment} ${hasStartupComment ? '❌ CORRUPT' : '✅ OK'}`);
+  console.log(`  Leaked <script src=workbench.js>: ${hasWorkbenchJS} ${hasWorkbenchJS ? '❌ CORRUPT' : '✅ OK'}`);
+  console.log(`  Leaked </html>: ${hasClosingHtml} ${hasClosingHtml ? '❌ CORRUPT' : '✅ OK'}`);
+  
+  // Check NOISE_RE is intact: should contain ')$', 'i'
+  const hasNoiseRE = jsCode.includes("')$', 'i'");
+  console.log(`  NOISE_RE ')$', 'i' preserved: ${hasNoiseRE} ${hasNoiseRE ? '✅ OK' : '❌ BROKEN'}`);
+  
+  // Try to parse JS
+  try {
+    new Function(jsCode);
+    console.log(`  JS Syntax: ✅ VALID — no SyntaxError`);
+    return true;
+  } catch (e) {
+    console.log(`  JS Syntax: ❌ SyntaxError — ${e.message}`);
+    // Find the problematic line
+    const lines = jsCode.split('\n');
+    const lineMatch = e.message.match(/line (\d+)/);
+    if (lineMatch) {
+      const lineNum = parseInt(lineMatch[1]);
+      console.log(`  Around line ${lineNum}:`);
+      for (let i = Math.max(0, lineNum - 3); i < Math.min(lines.length, lineNum + 3); i++) {
+        console.log(`    ${i+1}: ${lines[i].substring(0, 100)}`);
+      }
+    }
+    return false;
+  }
+}
+
+console.log('\n===== BUGGY VERSION (before fix) =====');
+const buggyOK = extractAndCheckJS(html_buggy, 'BUGGY');
+
+console.log('\n===== FIXED VERSION (after fix) =====');
+const fixedOK = extractAndCheckJS(html_fixed, 'FIXED');
+
+console.log('\n===== VERDICT =====');
+if (!buggyOK && fixedOK) {
+  console.log('✅ FIX CONFIRMED: Buggy version has SyntaxError, fixed version is clean.');
+} else if (buggyOK && fixedOK) {
+  console.log('⚠️  Both versions work — the bug may not reproduce in this environment.');
+} else if (!fixedOK) {
+  console.log('❌ FIX FAILED: Fixed version still has errors!');
+}