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_junk.js

@@ -0,0 +1,43 @@
+const {generateApprovalObserverScript} = require('../out/observer-script');
+let s = generateApprovalObserverScript(18080);
+
+// Extract the regex strings
+let junkMatch = s.match(/JUNK_CODE_RE\s*=\s*(\/[^;]+)/);
+let promptMatch = s.match(/PROMPT_ONLY_RE\s*=\s*(\/[^;]+)/);
+
+console.log('JUNK_CODE_RE:', junkMatch[1].substring(0, 100));
+console.log('PROMPT_ONLY_RE:', promptMatch[1]);
+
+// Use eval to construct the actual regexes
+let JUNK = eval(junkMatch[1]);
+let PROMPT = eval(promptMatch[1]);
+
+let tests = [
+  ['\u276f gravity_control > ', 'prompt only (no command)'],
+  ['\u276f extension > ', 'prompt only (extension)'],
+  ['\u276f gravity_control > $logFile = Join-Path $env:USERPROFILE', 'PS var assignment'],
+  ['\u276f extension > npm.cmd run compile', 'npm compile'],
+  ['\u276f gravity_control > Start-Sleep 12', 'Start-Sleep'],
+  ['\u276f gravity_control > git add -A; git commit -m "test"', 'git commit'],
+  ['\u276f gravity_control > node -e "const {gen}=require()"', 'node with require'],
+  ['\u276f gravity_control > Get-Content file.txt', 'Get-Content'],
+  ['\u276f gravity_control > npm.cmd version patch', 'npm version'],
+  ['function test() { return 1; }', 'JS function (should be JUNK)'],
+  ['const x = require("fs")', 'JS const (should be JUNK)'],
+  ['import { foo } from "bar"', 'JS import (should be JUNK)'],
+];
+
+console.log('\n=== CODE ELEMENT FILTER ANALYSIS ===');
+for (let [text, desc] of tests) {
+  let isJunk = JUNK.test(text);
+  let isPrompt = PROMPT.test(text.trim());
+  let junkPart = isJunk ? text.match(JUNK)[0] : null;
+  
+  let status;
+  if (isPrompt) status = 'SKIP-PROMPT';
+  else if (isJunk) status = 'SKIP-JUNK (' + junkPart + ')';
+  else status = 'PASS';
+  
+  let isBug = (isJunk || isPrompt) && text.indexOf('\u276f') !== -1 && text.trim().length > 25;
+  console.log((isBug ? 'BUG ' : '    ') + status.padEnd(40) + ' | ' + desc);
+}