Look no longer announces itself on the message row

A look's answer is the pane it opens or the place it jumps to; its own name
on the message row was only noise over that. Look now declares
`pub const quiet = true;`, like Msg, so runBuiltin skips the announcement.
A registry test checks that Look is quiet and Del still announces.

23 snapshot goldens drop the "Look" chip from the message row and nothing
else: chordcut find hscroll images jumps layout-open look-center look-dir
look-file look-file-1col lookloaded lsp lsp-client lspcomplete lsprelpath
psearch stepgrain syntax tag tagbottomimage tagnav ttylook ttytaken.
Updated with --update --jobs=1 on exactly those scripts; every changed row,
compared screen by screen against the old golden, differs only by the
blanked chip (and its style runs), and two full snap runs after the update
pass.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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