feat(P04): verification intelligence — git-native coverage, npm audit, TS compilation

---ci---
project: ci
phase: 4
milestone: v0.5
status: complete
decisions:
  - id: D-028
    decision: Phase 4 Verification Intelligence complete
    rationale: All INTEL requirements covered; 31 suites, 355 tests
    confidence: 0.95
    alternatives: []
requirements:
  covered: [INTEL-01, INTEL-02, INTEL-03]
---/ci---

src/verification/quality.ts

@@ -1,5 +1,6 @@
 import * as fs from "node:fs";
 import * as path from "node:path";
+import { execSync } from "node:child_process";
 import { VerificationLayer, VerificationResult, VerificationCheck } from "./types.js";
 
 interface CodeFinding {
@@ -66,6 +67,7 @@ export class QualityVerification extends VerificationLayer {
     checks.push(this.checkP2P3Findings(p2p3Findings));
     checks.push(this.checkTypeScriptStrictness(projectPath));
     checks.push(this.checkConsistentNaming(projectPath));
+    checks.push(this.checkTypeScriptCompilation(projectPath));
 
     const hasP0Fail = p0Findings.length > 3;
     const passed = !hasP0Fail;
@@ -226,6 +228,32 @@ export class QualityVerification extends VerificationLayer {
     );
   }
 
+  private checkTypeScriptCompilation(projectPath: string): VerificationCheck {
+    const tsconfigPath = path.join(projectPath, "tsconfig.json");
+    if (!fs.existsSync(tsconfigPath)) {
+      return this.check("TypeScript compilation", "skipped", "No tsconfig.json found");
+    }
+
+    try {
+      execSync("npx tsc --noEmit 2>&1", {
+        cwd: projectPath,
+        encoding: "utf-8",
+        timeout: 60000,
+        stdio: ["pipe", "pipe", "pipe"],
+      });
+      return this.check("TypeScript compilation", "pass", "TypeScript compiles without errors");
+    } catch (err) {
+      const execErr = err as { stdout?: string };
+      const output = execErr.stdout || "";
+      const errorCount = (output.match(/error TS/g) || []).length;
+      return this.check(
+        "TypeScript compilation",
+        errorCount > 5 ? "fail" : "warning",
+        `${errorCount} TypeScript compilation error(s)`
+      );
+    }
+  }
+
   private collectFiles(dir: string, files: string[]): void {
     const entries = fs.readdirSync(dir, { withFileTypes: true });
     for (const entry of entries) {