Software development workflow for AI coding agents. Activate when writing code, implementing features, fixing bugs, running tests, handling multi-milestone development, creating PRs, or doing full-stack development. Key rules: (1) All repos under _repos/ — never /tmp. (2) Subtask sizing — one focused task per agent run, split large milestones upfront. (3) Minimum deliverable PRs — smallest reviewable unit, one concern per PR. (4) Branch naming — `<type>/<short-description>` (feat/fix/chore/docs/refactor/test). Multi-stage work = sequential PRs to main with `-s1`, `-s2` suffix; no chained branches. (5) Design-first — no implementation without an approved spec. (6) Docs shi…
