Beautiful Mermaid Editor

Work from the Beautiful Mermaid editor source tree, not from generated HTML output.

Preconditions

1. If $ARGUMENTS includes a repo path, treat it as the starting point.
2. Before proposing edits, read the target repo's AGENTS.md, package scripts, and current editor source.
3. Treat editor.ts as the source of truth. Do not edit generated editor.html directly unless the target repo explicitly requires committed build artifacts.

Execution flow

1. Locate the real edit surface