M1 unbundled + deploy pipeline + M2 PR A (foundation) - #1

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claude/repo-exploration-do94hs

Commits on Aug 8, 2026

Unbundle challenge_keeper.py into the real module layout, add deployment pipeline
claude
committed
226013d

Commits on Aug 9, 2026

models: require create_challenge's start_date, drop the date.today() default
claude
committed
e42fd4b
M2 PR A: /newchallenge, board post+pin, join, timezone picker
claude
committed
8415f82