feat: DO-gated manual batch mode (auto default, office-only switches)

CHANGELOG.md

@@ -6,7 +6,30 @@ version tags are cut in this repo — POC stage, `main` is the release line).
 
 ## [Unreleased]
 
-Nothing pending.
+### Added
+- **DO-gated manual batch mode** (`auto` default · `do_manual` · legacy `manual`):
+  smartphone photo capture → OCR draft → plate-grouped start gates → net
+  expected/counted on live panel → stop soft-warn + force → discard only when
+  **both** `net_sack` and `net_box` are 0.
+- `config.yaml` `batch.default_mode` + `do:` block; `DoConfig` in
+  `src/config_loader.py`; runtime `$OUTPUT_DIR/do_settings.json`.
+- `delivery_orders` table + additive `batches` columns (`plate`, `do_numbers`,
+  `expected_*`, `net_*`); photo tree `do_photos/YYYY-MM-DD/` (7-day retention).
+- APIs: `POST /api/batch/stop-preview`, DO CRUD + `POST /api/do/upload`,
+  `GET|POST /api/do/settings` (office-only plate/do flags; **ocr_engine both
+  ports**), office-only mode/model_mode POST (403 on operator; 409 when batch active).
+- `src/do_batch.py` (pure gates/nets/units), `src/do_ocr.py`
+  (`extract_do_fields` tesseract|paddle|none).
+- Operator DO panel + OCR toggle; monitoring 3-way mode switch + model mode +
+  OCR/require-plate controls; history/export plate, DO, expected, net columns.
+- `docs/do-erd.md` (Mermaid ERD); tests `tests/test_do_batch.py`.
+
+### Changed
+- Default batch mode seed **`auto`** (was hard-coded `manual` when
+  `batch_mode.json` missing); `predict.py` accepts `do_manual` as operator-driven
+  and persists sack `unloading` for net-at-stop.
+- Finalize discard rule (dashboard stop **and** `predict.py` `finalize_batch`):
+  keep row if **either** net ≠ 0 (box-only batches no longer dropped).
 
 ## 2026-09-18 — Config tuning: Sack confidence and batch timeout