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/pyproject.toml

@@ -40,6 +40,7 @@ testpaths = ["tests"]
 [tool.ruff]
 line-length = 100
 target-version = "py311"
+extend-exclude = ["_gen"]
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP"]