Completed work

sf2loki

3 completed tasks.

SFL-0075CI hygiene: main-only buildx cache writes in ci.ymlhighchore1/1 AC SFL-0073Migrate the repo task surface to just and retire Makefiles and ad-hoc scriptsmediumchore0/11 ACwave:0-pilot SFL-0072Add Codex cloud environment setup scriptUnspecified4/4 AC