feat(standards): fix F11-F16 and rebuild bundle (43 components) + trial findings

- F11 PopulateRule field_name/collection_name corrections
- F12 service adaptor update handles PopulatingRepository
- F13 nested-references section; F14 authless /users/me guidance
- F15 template ruff-clean; F16 stop vendoring .ruff_cache, ship .gitignore
- document --template-style in build_recipe/spec_first_routing; refresh collected
  openapi-first + standards bundle (12 modules, 43 components)
- add trial.md and trial_findings.md (F1-F16, re-trial A/B evidence)

standards/mcp/templates/app/infra/db/repos/mongo.py

@@ -5,21 +5,20 @@ Generic MongoDB CRUD repo — single implementation for all domains.
 Select a concrete mongo-ops repository (base, cached, or populating) from the
 options supplied to the factory.
 """
-from typing import List, Optional, Type
 
 from mongo_ops import BaseRepository, CachedBaseRepository, PopulatingRepository
 from mongo_ops.cache import CacheBackend, CacheConfig
 from mongo_ops.models import BaseDocument
-from mongo_ops.populate import PopulationEngine, PopulateRule
+from mongo_ops.populate import PopulateRule, PopulationEngine
 
 
 def _repo_factory(
     collection: str,
-    db_model: Type[BaseDocument],
-    cache_backend: Optional[CacheBackend] = None,
-    cache_config: Optional[CacheConfig] = None,
-    engine: Optional[PopulationEngine] = None,
-    populate_rules: Optional[List[PopulateRule]] = None,
+    db_model: type[BaseDocument],
+    cache_backend: CacheBackend | None = None,
+    cache_config: CacheConfig | None = None,
+    engine: PopulationEngine | None = None,
+    populate_rules: list[PopulateRule] | None = None,
 ) -> BaseRepository:
     """Build the appropriate mongo-ops repository.