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/components.json

@@ -192,6 +192,12 @@
       "placeholder": "",
       "description": "Docker build-context exclusions."
     },
+    {
+      "kind": "gitignore",
+      "path": ".gitignore",
+      "placeholder": "",
+      "description": "VCS exclusions (caches, venv, generated _gen/)."
+    },
     {
       "kind": "compose",
       "path": "docker-compose.yaml",