plan

# plan Produce a feature's architecture plan — Checkpoint 4, the most consequential architectural checkpoint. Where engineering authority over **code design** and **performance** is exercised: the agent proposes, the human decides. Mixed mode — the agent proposes the architecture, the human confirms it, then the rest of the plan is drafted. ## When to use After `discover-acs` (Checkpoint 2) and `atdd:atdd` (Checkpoint 3). Produces `plan.md`. If `spec.md` is missing, warn — planning should follow spec formalization — but the user may override and plan from `acs.md` alone (flag the skipped step in the handoff). **Not for:** Given/When/Then specs (`atdd:atdd`); small changes to an existing plan (`feature-edit`). ## Workflow **Step 0 — Entry gate.** Before starting, verify the prior checkpoint is complete: run `${CLAUDE_PLUGIN_ROOT}/scripts/dae_handoff.py <feature-dir> --through 3`. On a non-zero exit, **stop** and surface the gap to the human — do not proceed. Verify branch hygiene: run `${CLAUDE_PLUGIN_ROOT}/scripts/dae_branch.py <feature-dir>`. On a non-zero exit, **stop** and surface the message to the human — switch branches and re-invoke. The check honors the `git.manual: true` manifest opt-out. After the gate passes, show the **pipeline breadcrumb**: run `${CLAUDE_PLUGIN_ROOT}/scripts/dae_progress.py <feature-dir>` and present its output to the human — it shows where this checkpoint sits in the DAE pipeline. The breadcrumb is advisory: a non-zero exit or a missin...