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/src/templates/app/.gitignore

@@ -0,0 +1,23 @@
+# Byte-compiled / caches
+__pycache__/
+*.py[cod]
+.ruff_cache/
+.pytest_cache/
+.mypy_cache/
+
+# Virtual environments
+.venv/
+venv/
+
+# Env
+.env
+
+# Generated wire contract (regenerate from openapi.yaml)
+_gen/
+
+# Packaging / coverage
+dist/
+build/
+*.egg-info/
+htmlcov/
+.coverage