cleanup: replace FIXMEs with tracked issues

examples/acp-agent/tests/acp.snapshot.ts

@@ -90,8 +90,8 @@ async function prepareFsSearchWorkspace(cwd: string): Promise<void> {
   }
 }
 
-// FIXME: Migrate backend-oriented scenarios to the headless stream-json suite;
-// this ACP suite should eventually retain only automation-protocol contracts.
+// https://github.com/deepseek-harness/deepseek-harness/issues/1970 tracks moving
+// backend/product scenarios to headless while retaining ACP protocol contracts here.
 
 function fixtureRecords(name: string): unknown[] {
   return readFileSync(join(SNAPSHOTS_DIR, name, 'session.jsonl'), 'utf8')