Build workforce-api REST + MCP layers (Layer 3), full build in one pass

16 routes: Office (single key, full CRUD + employees sub-resource)
and Employee (single key, full CRUD + reports + customers
sub-resources). MCP layer built with the single-route pattern from
the start.

Only domain where customer role has zero access — verified against
ReferenceDataPermission.check(): read_only/product_manager/support
get reads, writes are admin-only, customer isn't in the allow-list
at all. All 9 MCP tool ACLs reflect this exactly.

Keycloak (local): workforce-api-audience + mcp-workforce-audience
client scopes, resource clients, broker/librechat attachments.
Deploy key and broker secret reused/mirrored, same pattern as every
domain since payments-api.

dev/externalsecret.yaml

@@ -0,0 +1,25 @@
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: workforce-api-git-auth
+  namespace: workforce
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: vault-kong-v2
+  target:
+    name: workforce-api-git-auth
+  data:
+    - secretKey: identity
+      remoteRef:
+        key: kong-v2/workforce-api/git-deploy-key
+        property: identity
+    - secretKey: identity.pub
+      remoteRef:
+        key: kong-v2/workforce-api/git-deploy-key
+        property: identity.pub
+    - secretKey: known_hosts
+      remoteRef:
+        key: kong-v2/workforce-api/git-deploy-key
+        property: known_hosts