docs/v2: mark the split brief superseded by the split branch

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6897PWcUEwHiqZMcVnNF6

docs/v2/REFACTOR-PROMPT.md

@@ -1,5 +1,8 @@
 # Split gandora's index.html into ES modules — brief for a fresh agent
 
+> **Superseded.** The split already exists on the `split` branch (see `docs/v2/NOTES-FROM-POC.md`). Kept for its
+> rules and checklist, which still describe how to review that branch before it merges.
+
 You are refactoring **gandora/site** on teahub.xyz (Gitea; use the Teahub MCP tools: `tea_file_get`, `tea_file_edit`, `tea_file_change`, `tea_commit`, `tea_branch_create`, `tea_pull_create`; there is no git access from the container). The Mac **hb-5** is reachable through `boring_mac_exec` (120 s per call; long jobs with `nohup … &` then poll); a clone lives at `~/scratch/gsite` (`git pull -q` to refresh). Node is at `/opt/homebrew/bin/node`.
 
 Work on the **`dev` branch only.** Do not push to `main`. Open one PR at the end.