Update color field in 15 expert YAML configs to use neutral grayscale
and deep accent tones (gray 400-800, stone, amber, dark blue/green),
consistent with the expertIdentity.ts PALETTE and the project convention
for GitHub-style neutral UI coloring.
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Replace emoji across codebase: YAML avatars -> first char, frontend banners -> Ant Design Vue components, CLI status -> OK/FAIL/WARN labels, terminal -> [WARN]/[OK]/[PENDING], Bitable DB default -> table, App.vue font cleanup, test fixtures -> first char letters. shell.avatar type upgraded to string | Component.