fix(setup): treat method:local as adopted without drift in drift-check

plugins/magpie-setup/hooks/drift-check.test.ts

@@ -171,6 +171,21 @@ ref:    v1.0.0
       assert(result.message?.includes('Local snapshot lockfile missing'));
     });
 
+    test('returns false drift for local self-adoption method', async () => {
+      const fs = createTestEnv();
+      const exists = async (p: string) => await fs.exists(p);
+      const read = async (p: string) => await fs.read(p);
+      const lockContent = `method: local
+source: skills/
+`;
+      fs.set(joinPath(workspaceDir, '.apache-magpie.lock'), lockContent);
+
+      const result = await checkSetupDrift(exists, read, workspaceDir, pluginDir);
+      assertStrictEqual(result.isAdopted, true);
+      assertStrictEqual(result.hasDrift, false);
+      assertStrictEqual(result.message, undefined);
+    });
+
     test('resolves plugin version correctly from candidate paths', async () => {
       const fs = createTestEnv();
       const exists = async (p: string) => await fs.exists(p);

plugins/magpie-setup/hooks/drift-check.ts

@@ -396,7 +396,16 @@ export async function checkSetupDrift(
       };
     }
 
-    // 2. Snapshot methods (git-tag, git-branch, svn-zip)
+    // 2. Method: local (the framework checkout's self-adoption). Skills link
+    // the in-tree skills/ source, so there is no snapshot that can drift.
+    if (method === 'local') {
+      return {
+        isAdopted: true,
+        hasDrift: false,
+      };
+    }
+
+    // 3. Snapshot methods (git-tag, git-branch, svn-zip)
     if (method === 'git-tag' || method === 'git-branch' || method === 'svn-zip') {
       const localLockPath = joinPath(workspaceDir, '.apache-magpie.local.lock');
       const committedPin = lockData.ref || lockData.commit;