fix(tests): drop test_post_apply_without_backup_rejected (gate retired in 5535677)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_api_migrate.py

@@ -83,24 +83,11 @@ async def test_post_ingest_accepts_multipart_file(client, monkeypatch):
     assert resp.status_code == 202
 
 
-@pytest.mark.asyncio
-async def test_post_apply_without_backup_rejected(client, monkeypatch):
-    monkeypatch.setattr(
-        "backend.app.api.migrate._has_recent_pre_migration_backup",
-        lambda: False,
-    )
-    export = {
-        "source_app": "gallerysubscriber", "schema_version": 1,
-        "subscriptions": [], "credentials": [],
-    }
-    resp = await client.post(
-        "/api/migrate/gs_ingest",
-        form={"dry_run": "false"},
-        files={"export_file": _file_storage(export, "gs-export.json")},
-    )
-    assert resp.status_code == 400
-    body = await resp.get_json()
-    assert body["error"] == "no_backup"
+# Retired 2026-05-24: `test_post_apply_without_backup_rejected` asserted
+# the migration backup-gate rejected applies without a recent backup.
+# That gate was removed in commit 5535677 (_APPLY_KINDS is now empty,
+# FC-3h will own backup as a first-class feature) so the test was
+# testing dead behavior. Removed rather than rewritten.
 
 
 @pytest.mark.asyncio