fix: honor --dry-run in update and uninstall

packages/core/test/installer.test.ts

@@ -56,6 +56,21 @@ test("claude-code: 설치 → 드리프트 없음 → 제거", async () => {
   await assert.rejects(() => fs.access(plan.root));
 });
 
+test("removeInstall dryRun 은 파일과 매니페스트를 건드리지 않는다", async () => {
+  const plan = await planInstall("claude-code", "user", skill, env);
+  const res = await applyPlan(plan, skill.version, { env });
+
+  const dry = await removeInstall(res.record, { env, dryRun: true });
+  assert.equal(dry.removed.length, 3);
+  assert.equal(dry.keptModified.length, 0);
+  await fs.access(path.join(plan.root, "SKILL.md"));
+  assert.equal((await readManifest(home)).installs.length, 1);
+
+  const real = await removeInstall(res.record, { env });
+  assert.equal(real.removed.length, 3);
+  assert.equal((await readManifest(home)).installs.length, 0);
+});
+
 test("사용자가 고친 파일은 update 가 건너뛴다", async () => {
   const plan = await planInstall("claude-code", "user", skill, env);
   const first = await applyPlan(plan, skill.version, { env });