diff --git a/CUTOVER-NOTES.md b/CUTOVER-NOTES.md
index 00753b6..845e21c 100644
--- a/CUTOVER-NOTES.md
+++ b/CUTOVER-NOTES.md
@@ -69,10 +69,42 @@ deploy.
    a `uses: ./.forgejo/workflows/build.yml` + `with:` job must pass its input.
    If paths aren't honored, fall back to the pr-build pattern (diff job +
    gated jobs) for the push workflows too.
-3. **Land the in-flight split-repo branches** (backend/frontend
-   `reconcile-dev-with-main`, infra `phase5/discord-bot-flag`, …) in the split
-   repos, then re-subtree or graft the deltas — this assembly is `origin/main`
-   as of 2026-07-22 and goes stale as those merge.
+3. **Branch drift**: the split repos' branch state as of 2026-07-22 evening is
+   fully migrated (see "Branch migration status" below) — re-run the check
+   (`git merge-tree --write-tree` per branch vs dev/main) if cutover slips and
+   upstream moves again.
+
+## Branch migration status (2026-07-22)
+
+Checked every split-repo branch by dry-run merge; migrated everything real:
+
+- **`dev` (this repo)** = `main` + backend/frontend `origin/dev` subtrees: the
+  in-image test CI feature (ported into root `build.yml` — backend full suite,
+  frontend unit tier; their subtree `build.yml` edits resolved as deleted) +
+  backend test scripts/Makefile/compose.test + frontend two-tier suite with
+  fixtures. Faithful to upstream: the feature is dev-only, so mono `main`
+  doesn't have it; promote with dev→main like the split flow.
+- **`feature/geocode-local` → `feature/history-meteostat-gusts` →
+  `feature/nasa-primary-flip` → `feature/era5-seed`** — the unmerged backend
+  stack, rebuilt stacked on mono `dev`. ⚠️ Two conflicts were resolved here
+  that upstream has NOT resolved (the same conflicts exist merging those
+  branches into split-repo dev): `data/climate.py` (dev's hardened `_request`
+  signature combined with the gust-fill wrap) and `tests/data/test_climate.py`
+  (kept both appended test blocks). **Unverified** — tests weren't runnable
+  locally (Docker Hub blocked); run the in-image suite on these branches
+  before trusting them.
+- **Stale (absorbed upstream, nothing migrated — safe to delete in the split
+  repos):** backend `ci-run-tests-in-image`, `perf/*`,
+  `phase5/discord-gateway-bot`, `port-discord-gateway-bot`,
+  `reconcile-dev-with-main`, `test-runner-and-smoke`; frontend
+  `ci-run-tests-in-image`, `reconcile-dev-with-main`; all three infra branches
+  (`ci-fix/render-secrets-owner`, `phase5/discord-bot-flag`,
+  `terraform-two-image-tags` — all landed in infra `main`); both observability
+  dashboard branches.
+- **Dismissed, not stale-but-not-migrated:** frontend
+  `perf/frontend-responsiveness` (its "new" content would resurrect test
+  files dev reorganized into the unit tier) and `test-real-backend-harness`
+  (an older revision of dev's `tests/unit/test_rendering.py`).
 
 ## Cutover runbook