milestone: enforce required services and add mongo logger PoC path

wiki/08-template-system.md

@@ -12,6 +12,21 @@ templates/
 └── mst_logger_rec.toml    ← logger collection template
 ```
 
+## Runtime Template Registry (Implemented)
+
+At IPL, BEDS now loads REC templates from `templates/` into a typed runtime registry and validates them before service connectivity checks.
+
+Current runtime validation enforces:
+
+- Any field listed in `protected_fields` must exist in `[fields]`.
+- Any field listed in `index_fields` must exist in `[fields]`.
+- Any key in `[single_field_indexes]`, `[unique_indexes]`, and `[ttl_indexes]` must exist in `[fields]`.
+- Every field used in `[compound_indexes]` and `partial_indexes` qualifiers must exist in `[fields]`.
+- Every field used in `regex_pattern_indexing` and `[cache_map]` must exist in `[fields]`.
+- Every `compound_indexes` index name must be present in `index_name_list`.
+
+In `production`, template registry validation failures are fatal during IPL. In non-production environments, failures are warning-only to preserve local POC workflows.
+
 ## Two Template Types
 
 | Type | Schema | Database | Use Case |