feat(harness): config.py + workspace.py (D3 confine) + chirone.example.yaml

- config.py ported from ChironeWp3, PSD_PROFILE -> THOTH_PROFILE; dual vector key
  (vector_rest/vector_write_rest top-level) preserved verbatim
- workspace.py: thin boundary wrapper (D3) around load_config
- workspaces/chirone.example.yaml: aligned to the real Config shape
- tests/test_workspace.py: 2 tests (env expand + dual key; missing env raises)
- .env.example: added DWH + DOCS_ROOT vars
All tests pass (2/2).

harness/.env.example

@@ -4,9 +4,17 @@ THOTH_PROFILE=server
 # Workspace DB (relational, direct transport) — example: chirone
 THOTH_DB_HOST=
 THOTH_DB_PORT=5432
+THOTH_DB_NAME=
 THOTH_DB_USER=
 THOTH_DB_PASSWORD=
 
+# DWH via REST (richiesto se database.transport = rest)
+THOTH_DWH_REST_URL=https://supabase-aritmolab.policlinicosandonato.it/dwh/
+THOTH_DWH_API_KEY=
+
+# Evidence source root (cartella curata a mano con le evidence)
+THOTH_DOCS_ROOT=
+
 # Vector REST — LETTURA (rpc search_similar) sul Supabase remoto
 THOTH_VEC_REST_URL=https://host/vector/v1/
 THOTH_VEC_API_KEY=