Add the guide for reading quality-check results

Explain how to call the shared quality-checks workflow, read a failed run,
fix the typical findings of ruff, mypy, shellcheck and shfmt, reproduce a
run locally and configure the tools through the project's own files,
including the shfmt .editorconfig route found in the RepoFoundry trial.
Add the QualityChecks wiki page with its Danish and Bahasa Malaysia
translations, update the capability row and teach build_wiki.py the page.

Task: MIL-003#5

tests/test_build_wiki.py

@@ -96,7 +96,7 @@ def _write_sources(root: Path) -> None:
         "### 🔄 Sync\nDetails.\n\n## 📄 License\nMIT.\n",
         encoding="utf-8",
     )
-    for name in ("onboarding", "credentials", "troubleshooting"):
+    for name in ("onboarding", "credentials", "troubleshooting", "quality-checks"):
         (root / "guides" / f"{name}.md").write_text(
             f"# {name.title()}\nBody.\n", encoding="utf-8"
         )