Loop through a spec — write the plan, implement, test, changelog, commit, repeat until Shipped

The phase-execution loop that took Augment-From-DB-Flow.md from Signed-Off to Shipped in one day: each spec phase becomes a plan authored against the live code, executed immediately, proven as far as scripts can reach, changelogged, and pushed as its own attempt() commit — with a milestone() marker when the spec runs dry.