Two places draw an agent's mark and each decided its colour on its own:
the tab strip took a `TraeCode` branch added in #807, and the tray icon
recoloured every glyph white regardless. So TraeCode came out green on a
tab and white in the tray — one agent with two faces.
The colour now lives on `CLIAgent::icon_rgb`, next to `accent_rgb`, and
both sites read it. White for every mark that is a silhouette on its
brand colour; TraeCode is the one whose mark carries the colour itself.
`the_tray_draws_each_mark_in_the_agents_own_colour` walks `CLIAgent::ALL`
and asserts the tray's solid pixels contain the agent's own mark colour,
so a future agent whose mark is not white cannot be added to one draw
site alone.
l0ng-ai
5c2a02f064