small gleam coding and persistent agent daemon with a detachable cli and a canvas ui albedo.sh

feat: imagegen support #247

Merged poggers.website
targeting main from poggers.website/albedo:feat/codex-imagegen-upstream
Merged opened by and assigned to poggers.website
targeting main from poggers.website/albedo:feat/codex-imagegen-upstream

as requested, imagegen but as codex driver + reusable frontend. tested only against codex imagegen, but since they're the one deciding the spec anyway this shouldn't be that bad.

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