The drive-half complement to clide status (observe): an agent can now
open a doc in a GUI reader from the CLI so it can show the user what
it's looking at. 'clide ui open tickets T-48' (decisions by id,
markdown by path) publishes a 'selection' to the kernel MessageBus that
the reader's ReaderNav picks up.
The verb (ui_command.dart) is decoupled from the kernel via a publish
callback, wired in main.dart to the post-boot-captured MessageBus, so it
stays Flutter-free under dart test. Reads CLI positionals or named args.
Also files T-232 (CLI argv args don't reach typed handlers -- the gating
drive-the-IDE bug) and T-233 (diff-panel ui.open follow-up).
Closes T-231 (under T-208).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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