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/pipelines/shared/loader.py

@@ -9,7 +9,6 @@ from pathlib import Path
 from typing import Any
 
 import yaml
-
 from hexa import build
 
 

standards/mcp/templates/app/pipelines/shared/registry.py

@@ -4,13 +4,12 @@ Family registry — resolve a ``(kind, variant, mode)`` triple to a root class.
 
 A single lookup replaces hand-rolled ``if/else`` family selection.
 """
-from typing import Dict, Type
 
 # Populated by ``register`` as families import.
-_FAMILIES: Dict[str, Dict[str, Dict[str, Type]]] = {}
+_FAMILIES: dict[str, dict[str, dict[str, type]]] = {}
 
 
-def register(kind: str, variant: str, root_cls: Type, mode: str = "default") -> Type:
+def register(kind: str, variant: str, root_cls: type, mode: str = "default") -> type:
     """Register ``root_cls`` for a ``(kind, variant, mode)`` triple.
 
     Returns:
@@ -20,7 +19,7 @@ def register(kind: str, variant: str, root_cls: Type, mode: str = "default") ->
     return root_cls
 
 
-def resolve_root(kind: str, variant: str, mode: str = "default") -> Type:
+def resolve_root(kind: str, variant: str, mode: str = "default") -> type:
     """Return the root class for a ``(kind, variant, mode)`` triple.
 
     Raises: