Initial public release

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+# Skill: PostGIS Migration
+
+Use this skill when creating database models, migrations, geometry storage or spatial indexes.
+
+## Read first
+
+- `docs/DATABASE_SCHEMA.md`
+- `docs/DATABASE_IMPLEMENTATION_PLAN.md`
+- `docs/standards/GIS_STANDARDS.md`
+- `docs/specs/STATE_MACHINES.md`
+- relevant ADRs
+
+## Spatial rules
+
+- PostgreSQL + PostGIS is mandatory.
+- Store canonical geometry in PostGIS geometry columns.
+- Preserve original CRS metadata on datasets.
+- Normalize internal spatial operations according to GIS standards.
+- Create spatial indexes for queryable geometries.
+- Use explicit units for area, distance and length.
+
+## Migration checklist
+
+- [ ] Add model.
+- [ ] Add migration.
+- [ ] Add indexes.
+- [ ] Add constraints.
+- [ ] Add state enum where required.
+- [ ] Add rollback-safe migration where practical.
+- [ ] Add fixture/test coverage for geometry roundtrip.
+
+## Forbidden shortcuts
+
+- No geometry as unvalidated plain text for canonical records.
+- No silent CRS assumptions.
+- No schema drift from docs without updating the contract.
+
+## Completion report fields
+
+- Tables changed.
+- Geometry columns added.
+- Indexes added.
+- Migration commands run.
+- Compatibility risks.