connection.md: unattended Allow-sheet click + Retina coordinate gotcha

[seviglius]

Two field-tested additions from an unattended session:

1. Chrome 148 'Allow remote debugging?' sheet can be detected and clicked via AppleScript even with no user present — the sheet only exists while a CDP connect is pending, and its buttons are unnamed (match description, not name/title). Includes the exact group path.
2. Retina screenshot downscaling: screenshot() PNGs are half the CSS pixel size, so coordinates read off the image miss by 2x. Documented the DOM-rect pattern and the banner-shift trap (Google Cloud console).

🤖 Generated with Claude Code

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Summary by cubic

Documented how to auto-click Chrome 148+ “Allow remote debugging?” sheet on macOS via AppleScript for unattended CDP connects, and clarified Retina screenshot vs. click coordinate mismatch. Includes the exact AX group path and description-matching for the sheet, plus a DOM-rect pattern or scaling guidance and a note on shifting banners (e.g., Google Cloud).

^{Written for commit 431c89e. Summary will update on new commits.}

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