Headless tests cover a double-click on a symbol in Thumbnail View and List View, the panel
menu's Edit Symbol with and without a selected instance, the Control bar's Edit Symbol button,
and the Control bar's Exit Symbol Editing Mode and Exit Isolation Mode buttons inside the
symbol's art. The panel's module comment now says a double-click opens the symbol in symbol
editing mode, and docs/mcp.md lists symbol.edit's ids parameter.
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