fix(observer): v32 터미널 프롬프트 조기감지 — JUNK/PROMPT 필터 전에 명령어 추출 (v0.5.97)

근본원인: code 요소의 textContent '❯ project > command'가 PowerShell 키워드
(return, function, const)를 포함할 수 있어 JUNK_CODE_RE에 잘못 걸림.
v32: ❯ 마커로 시작하는 code 텍스트는 JUNK/PROMPT 전에 명령어 직접 추출.
14/14 E2E 테스트 통과.

extension/scratch/verify_regex.js

@@ -0,0 +1,42 @@
+const {generateApprovalObserverScript} = require('../out/observer-script');
+let s = generateApprovalObserverScript(18080);
+
+// Find the regex used in v30 candidate matching
+let idx = s.indexOf('candT.match(');
+if (idx < 0) idx = s.indexOf('sibT.match(');
+let reStr = s.substring(idx, s.indexOf(');', idx) + 1);
+console.log('Match code:', reStr.substring(0, 60));
+
+// Extract just the regex part
+let reMatch = reStr.match(/\/(.*?)\//);
+let reSource = reMatch ? reMatch[0] : 'NOT FOUND';
+console.log('Regex source:', reSource);
+
+// Build and test the actual regex
+let re = new RegExp(reMatch[1]);
+console.log('Regex object:', re);
+
+// Test with the EXACT patterns from logs
+let tests = [
+  ['Normal', '\u276f gravity_control > Start-Sleep 12 content_copy'],
+  ['Git cmd', '\u276f gravity_control > git add -A; git commit -m "test"'],
+  ['Short', '> content_copy'],
+  ['Prompt only', '\u276f gravity_control > '],
+  ['Dir cmd', '\u276f gravity_control > dir content_copy'],
+];
+
+console.log('\n=== REGEX TESTS ===');
+let stripRe = /\s*(content_copy|content_paste|play_arrow|check_circle|keyboard_arrow[_a-z]*)\s*$/;
+for (let [name, text] of tests) {
+  let m = re.exec(text);
+  if (m) {
+    let raw = m[1].trim();
+    let cleaned = raw.replace(stripRe, '').trim();
+    console.log(name + ':');
+    console.log('  raw match[1]: "' + raw + '"');
+    console.log('  after strip:  "' + cleaned + '"');
+    console.log('  length ok:    ' + (cleaned.length >= 3));
+  } else {
+    console.log(name + ': NO MATCH');
+  }
+}