Doc Examples Must Render

All documentation examples/configs must be compatible with the docs build/render pipeline and current Mermaid configuration conventions.

Apply this checklist when touching documentation:

• Use the current config mechanism: prefer YAML/frontmatter (and themeVariables) over deprecated %%{init: ...}%% in examples.
• Version-gate features in docs using (v<MERMAID_RELEASE_VERSION>+) (or the project’s equivalent placeholder) when the behavior is version-dependent.
• Never duplicate render blocks: if the docs tooling auto-renders mermaid-example, include one block—don’t add multiple identical code fences.
• Keep code fences and syntax valid for the renderer (no extra punctuation/backticks that would prevent rendering).
• Prefer Mermaid-supported formatting for diagram text (avoid relying on Markdown-only behavior when Mermaid parsing expects different line-break semantics).
• Use relative internal links in source docs (so site link rewriting works).

Example (correct: frontmatter + single mermaid-example + version tag):

```mermaid-example
---
title: ELK layout example
config:
  layout: elk
---
erDiagram
  CUSTOMER ||--o{ ORDER : places
  ORDER ||--|{ LINE-ITEM : contains

```

Example (avoid):

• Using %%{init: ...}%% when examples have been migrated to YAML/frontmatter.
• Copy-pasting the same mermaid-example block twice (final docs will render duplicates).