diff --git a/domain/sap10_calculator/docs/HANDOVER_FRESH_API_DEBUG.md b/domain/sap10_calculator/docs/HANDOVER_FRESH_API_DEBUG.md
index 9dd46134..2a982f38 100644
--- a/domain/sap10_calculator/docs/HANDOVER_FRESH_API_DEBUG.md
+++ b/domain/sap10_calculator/docs/HANDOVER_FRESH_API_DEBUG.md
@@ -4,10 +4,26 @@ Point-in-time note. Start from [`AGENT_GUIDE.md`](AGENT_GUIDE.md) for methodolog
 1e-4 bar, the per-line debugging loop, the section helpers, and the suite command.
 
 - **Branch:** `feature/per-cert-mapper-validation`
-- **HEAD:** `f895dd3a` (S0380.217). Confirm with `git rev-parse HEAD`.
+- **HEAD:** `6d9ef114` (S0380.218). Confirm with `git rev-parse HEAD`.
 - **Baseline (AGENT_GUIDE §4 suite):** `tests/domain/sap10_calculator/ backend/documents_parser/tests/`
-  → green (2388 passed, 1 skipped at HEAD; the golden + worksheet pins all pass).
-- **Next slice number:** **S0380.218**.
+  → green (2392 passed, 1 skipped at HEAD; the golden + worksheet pins all pass).
+- **Next slice number:** **S0380.219**.
+
+> **S0380.218 (DONE) — Part 1 closed for the "with api 3" pair.** The two
+> certs the user dropped under `sap worksheets/with api 3/` —
+> `0340-2467-9260-2006-6521` (Summary_000922 / dr87 000922) and
+> `5500-5070-0822-0201-3663` (Summary_000920 / dr87 000920) — are **clean**.
+> Fetched fresh, run through BOTH front-ends, both paths agree to <1e-4 on
+> SAP/cost/CO2/PE AND reproduce the worksheet (255)/(272)/(286)/(33)/(37)
+> exactly. SAP integer = lodged (resid +0) on both. **No mapper/calculator
+> bug surfaced.** Dropped-field audit clean (only `created_at` +
+> `_normalize_shower_outlets`-handled shower keys). Locked in as golden
+> fixtures: 2 JSONs under `fixtures/golden/` + entries in `_EXPECTATIONS`
+> and `_WORKSHEET_PE_CO2` (test_golden_fixtures.py). The Summary path was
+> validated manually but is NOT pinned in a committed test (would need the
+> Summary PDFs copied into `backend/documents_parser/tests/fixtures/` + a
+> textract-preprocessed chain test) — a cheap follow-up if cross-mapper
+> parity wants a standing regression guard beyond the API-path golden pin.
 - **Pre-existing failures (NOT yours, out of scope):**
   - `domain/sap10_ml/tests/test_rdsap_uvalues.py` — 2 stone-§5.6 thin-wall failures
     (granite + sandstone band A, 3.7408 vs Table-6 1.7 cap). Run this suite when you touch