feat: enforce the adapter barrel boundary in the architecture gate

그룹 바깥에서 어댑터 내부 파일을 직접 import하면 check:architecture가
거부한다. 회귀 fixture 2개가 거부와 허용을 각각 고정한다 — 규칙 이름을
바꿔 보면 fixture 검사가 먼저 깨지는 것을 확인했다.

도착점 정규식은 중첩 수량자 대신 교대를 쓴다. dependency-cruiser의 안전
정규식 검사가 (?:[^/]+/)? 안의 + 를 unsafe로 거부하기 때문이다.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/check-architecture.ts

@@ -824,12 +824,13 @@ async function runGraphFixtureChecks(): Promise<GraphFixtureResult> {
     "tests/fixtures/architecture/dependency-graph",
   );
   const allowedRoot = resolve(fixtureRoot, "allowed");
-  const [allowedGraph, unresolvedGraph, layerGraph, cycleGraph] =
+  const [allowedGraph, unresolvedGraph, layerGraph, cycleGraph, barrelGraph] =
     await Promise.all([
       analyzeSourceGraph(allowedRoot, "src"),
       analyzeSourceGraph(resolve(fixtureRoot, "unresolved"), "src"),
       analyzeSourceGraph(resolve(fixtureRoot, "layer"), "src"),
       analyzeSourceGraph(resolve(fixtureRoot, "cycle"), "src"),
+      analyzeSourceGraph(resolve(fixtureRoot, "barrel"), "src"),
     ]);
   const allowedFiles = new Set(await listFiles(allowedRoot));
   const allowedSourceFile = resolve(
@@ -850,6 +851,21 @@ async function runGraphFixtureChecks(): Promise<GraphFixtureResult> {
     ),
   );
   const assertions = [
+    {
+      name: "deep adapter import from outside the group is rejected",
+      passed: blockingViolations(barrelGraph).some(
+        ({ rule, source, target }) =>
+          rule === "adapter-groups-are-reached-through-their-barrel" &&
+          source === "src/bootstrap/compose-deep.ts" &&
+          target === "src/adapters/http/client.ts",
+      ),
+    },
+    {
+      name: "barrel import from outside the group is accepted",
+      passed: !blockingViolations(barrelGraph).some(
+        ({ source }) => source === "src/bootstrap/compose-barrel.ts",
+      ),
+    },
     {
       name: "explicit TS specifier resolves to a TS module",
       passed: allowedGraph.dependencies.some(