Add governed bathymetry profile workflow

backend/README.md

@@ -1708,3 +1708,23 @@ The command never deletes projects or related datasets, jobs, analyses,
 quality checks and exports. It always preserves `Kempen Regional Workbench`
 and `Mol Municipality Workbench`, defaults to dry-run and can print every
 matched name with `--show-names`.
+
+## Governed VHA bathymetry profiles
+
+`POST /api/v1/projects/{project_id}/datasets/bathymetry/profiles/acquire`
+performs a bounded official VHA ArcGIS query, exact persisted-Area clipping,
+watercourse-name normalization and ordinary Dataset/VectorFeature persistence.
+`GET /api/v1/projects/{project_id}/datasets/bathymetry/sources` reports VHA as
+operational and the audited MDK/SPW candidates as unavailable for acquisition.
+
+Runtime controls are `BATHYMETRY_PROFILES_ENABLED`,
+`BATHYMETRY_PROFILES_LAYER_URL`, `BATHYMETRY_WATERCOURSE_LAYER_URL`,
+`BATHYMETRY_PROFILES_PAGE_SIZE`, `BATHYMETRY_PROFILES_MAX_FEATURES`,
+`BATHYMETRY_PROFILES_TIMEOUT_SECONDS` and
+`BATHYMETRY_PROFILES_MAX_RESPONSE_MB`. The feature limit intentionally forces
+large Flemish scopes into exact Area partitions.
+
+The Dataset exposes profile count and nullable structured depth/width metrics.
+It does not claim a continuous bed model, current depth or volume. Use
+`scripts/provision_mol_bathymetry_profiles.py` for the canonical Mol operator
+flow.