Mermaid diagram fails to render with node labels starting with `/`

[danhdx2]

🐛 Bug: Mermaid diagram fails to render with node labels starting with /

Description

When generating Mermaid diagrams, labels starting with / cause a rendering failure.

Example error:

Lexical error on line 2. Unrecognized text.
... A[/archie command] --> B[Fetch issue
-----------------------^

Reproduction

graph LR
    A[/archie command] --> B[Fetch issue or PR details]
    B --> C[Extract relationships and concepts]
    C --> D[Select diagram types]
    D --> E[Generate 1-3 Mermaid diagrams]
    E --> F[Validate syntax]
    F --> G[Post comment with diagrams]

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Expected behavior

Diagram should render correctly.

Actual behavior

Mermaid fails to parse the diagram due to invalid syntax.

Root cause

Mermaid does not support unescaped special characters (e.g. /) at the beginning of node labels.

Suggested fix

Wrap labels in quotes to ensure proper parsing:

graph LR
    A["/archie command"] --> B["Fetch issue or PR details"]
    B --> C["Extract relationships and concepts"]
    C --> D["Select diagram types"]
    D --> E["Generate 1-3 Mermaid diagrams"]
    E --> F["Validate syntax"]
    F --> G["Post comment with diagrams"]

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Additional context

This issue affects auto-generated diagrams (e.g. via Archie command), where labels may include special characters.