Day 13 — Build

• Devs implement in parallel isolated sessions, plan mode first, PRs per ticket.
• QA authors the automated suite alongside; BA updates the spec as questions resolve.
• Rule of the day: every artifact of work (spec, tests, PRs, notes) is Claude-assisted and human-edited.

Skills today

• Plan mode: Approve the plan before any code is written — the biggest lever for trusting agentic work on real tickets
  How to set up

  See Day 4 for the setup steps.

• Git worktrees + parallel sessions: Two tickets in flight, two isolated agents, zero crosstalk
  How to set up

  See Day 6 for the setup steps.