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)

build.py

@@ -241,6 +241,8 @@ _TEMPLATE_COMPONENTS: list[dict[str, str]] = [
      "description": "API + worker image with private-index wiring."},
     {"kind": "dockerignore", "path": ".dockerignore", "placeholder": "",
      "description": "Docker build-context exclusions."},
+    {"kind": "gitignore", "path": ".gitignore", "placeholder": "",
+     "description": "VCS exclusions (caches, venv, generated _gen/)."},
     {"kind": "compose", "path": "docker-compose.yaml", "placeholder": "",
      "description": "api + worker + mongo compose file."},
     {"kind": "env-example", "path": ".env.example", "placeholder": "",
@@ -319,7 +321,10 @@ def build_templates(folder: Path, dry_run: bool = False) -> None:
     out_dir.parent.mkdir(parents=True, exist_ok=True)
     shutil.copytree(
         src, out_dir,
-        ignore=shutil.ignore_patterns("__pycache__", "*.pyc"),
+        ignore=shutil.ignore_patterns(
+            "__pycache__", "*.pyc", ".ruff_cache", ".pytest_cache",
+            ".mypy_cache", ".venv", "venv", ".git", "*.egg-info", "htmlcov",
+        ),
     )
     manifest = build_components_manifest(out_dir)
     (folder / "mcp" / "components.json").write_text(