Add AI handoff browser smoke

docs/CODEX_EXECUTION_LOG.md

@@ -3638,3 +3638,27 @@ Limitations:
 
 Next recommended pass:
 - After deploy and live validation, add a raster fixture/demo upload smoke so AI Labs and raster controls can be validated with a connected raster state.
+
+## Sprint 101 AI Lab handoff browser smoke (2026-06-24)
+
+Changed:
+- Added `scripts/verify_ai_handoff_interactions.sh`.
+- The script seeds the explicit offline demo workflow through the frontend-facing API, creates a small raster tile manifest, opens the browser workbench with Playwright/Chromium, clicks `Use in Detection Lab` and `Use in Segmentation Lab`, and verifies both AI Lab forms receive the selected raster dataset plus `Raster tile manifest path`.
+- Added syntax coverage for the new script to `scripts/run_readiness_check.sh`.
+- Added `backend/tests/test_sprint101_ai_handoff_interaction_smoke.py`.
+- Updated `scripts/README.md` and `CHANGELOG.md`.
+
+Tested:
+- Red step: `python -m pytest backend\tests\test_sprint101_ai_handoff_interaction_smoke.py -q` failed while `scripts/verify_ai_handoff_interactions.sh` was absent.
+- `python -m pytest backend\tests\test_sprint101_ai_handoff_interaction_smoke.py -q` (`1 passed`)
+- `bash -n scripts/verify_ai_handoff_interactions.sh`
+- Local Node Playwright availability check failed with `ERR_MODULE_NOT_FOUND`, so live browser-click execution requires Playwright to be installed or exposed in the runner environment.
+
+Open:
+- Complete broad validation, deploy and live runtime checks for this pass.
+
+Limitations:
+- Test/smoke tooling only; no product behavior, API contract, migration, AI dependency, provider fetching or model behavior changes.
+
+Next recommended pass:
+- After validation and deploy, keep using the AI handoff smoke as the browser-level regression guard for raster-to-AI workspace wiring.