feat(ci): enable GitHub Actions CI pipeline and add E2E test scripts

Enable CI and PR check workflows by removing .disabled suffix. Add 12
new test:e2e:* package.json scripts for frontend-drills, regex,
pattern-quiz, and interview specs. Fix Angular validator to skip
setupCode pattern check for informational scaffolding.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: davidagustin

.github/workflows/ci.yml.disabled .github/workflows/ci.yml.github/workflows/ci.yml.disabled renamed to .github/workflows/ci.yml

@@ -30,11 +30,12 @@ export function validateFrontendDrillAnswer(
     problem.validPatterns &&
     problem.validPatterns.length > 0
   ) {
-    const patternResult = checkRequiredPatterns(
-      userAnswer,
-      problem.validPatterns,
-      problem.setupCode,
-    );
+    // Pass empty setupCode so the "must use setup variables" check is
+    // skipped.  Angular setupCode is informational scaffolding (e.g.
+    // `const template = '';`) that the answer never references — the
+    // validPatterns already verify correctness.  Syntax checking
+    // (bracket balance) still runs because it doesn't depend on setupCode.
+    const patternResult = checkRequiredPatterns(userAnswer, problem.validPatterns, '');
     if (patternResult) {
       return patternResult; // Failed pattern check
     }

.github/workflows/pr-check.yml.disabled .github/workflows/pr-check.yml.github/workflows/pr-check.yml.disabled renamed to .github/workflows/pr-check.yml

@@ -39,6 +39,18 @@
     "test:e2e:cpp-problems": "playwright test e2e/problems/cpp-problems.spec.ts",
     "test:e2e:csharp-problems": "playwright test e2e/problems/csharp-problems.spec.ts",
     "test:e2e:c-problems": "playwright test e2e/problems/c-problems.spec.ts",
+    "test:e2e:frontend-drills": "playwright test e2e/frontend-drills/",
+    "test:e2e:frontend-landing": "playwright test e2e/frontend-drills/landing.spec.ts",
+    "test:e2e:frontend-hub": "playwright test e2e/frontend-drills/framework-hub.spec.ts",
+    "test:e2e:frontend-drill": "playwright test e2e/frontend-drills/drill-mode.spec.ts",
+    "test:e2e:frontend-quiz": "playwright test e2e/frontend-drills/quiz-mode.spec.ts",
+    "test:e2e:frontend-training": "playwright test e2e/frontend-drills/training.spec.ts",
+    "test:e2e:frontend-patterns": "playwright test e2e/frontend-drills/ui-patterns.spec.ts",
+    "test:e2e:frontend-pattern-detail": "playwright test e2e/frontend-drills/ui-pattern-detail.spec.ts",
+    "test:e2e:frontend-cheatsheet": "playwright test e2e/frontend-drills/cheatsheet.spec.ts",
+    "test:e2e:regex": "playwright test e2e/regex-trainer.spec.ts",
+    "test:e2e:pattern-quiz": "playwright test e2e/pattern-quiz.spec.ts",
+    "test:e2e:interview": "playwright test e2e/interview.spec.ts",
     "viz:list": "tsx scripts/create-visualization-agent.ts list",
     "viz:next": "tsx scripts/create-visualization-agent.ts next",
     "viz:generate": "tsx scripts/create-visualization-agent.ts generate",