refine

# refine Charter-bound clean-up of a feature's changed code — Checkpoint 6. Modeled on Claude Code's stock `/simplify` (a three-subagent parallel review) with two layers the stock skill lacks: **charter validation** of every proposal, and **graceful breaking changes**. The behavior contract (ACs + specs) is sacred — a refactor that breaks it is a category error. New shapes are introduced alongside old, never instead of. ## When to use Checkpoint 6, after `atdd:atdd-team` produces passing code, before `crap-analyzer` (Checkpoint 7). **Verification independence:** if `manifest.verification.apply_to_checkpoints` includes `6`, refine must run on a non-implementer agent. The three review subagents (Step 2) are fresh regardless, so independence is satisfied by construction. **Not for:** changing behavior (`feature-edit`); risk analysis (`crap-analyzer`); code that isn't implemented/green yet. ## Workflow **Step 0 — Entry gate.** Before starting, verify the prior checkpoint is complete: run `${CLAUDE_PLUGIN_ROOT}/scripts/dae_handoff.py <feature-dir> --through 5`. On a non-zero exit, **stop** and surface the gap to the human — do not proceed. Verify branch hygiene: run `${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/...