drive-change — implement + audit + fix the current change

/drive-change is the workhorse for changes that don't need formal planning. It:

1. Writes the implementation if conversation intent describes work to do.
2. Runs the full audit pipeline (slice → fan-out to /review-* specialists → merge → verify) via the agent layer.
3. Dispatches fix-applier agents in parallel to act on the findings (sensitivity-gated to Opus when the file path matches auth/crypto/IPC patterns).
4. Produces a unified report grouped by severity.

For substantial changes warranting an ADR + Gherkin spec, use /drive-plan instead. For audit-only (no fixes), use /review-change.

Phase 0 — Scope

Find what changed:

# PR context first
gh pr diff --name-only 2>/dev/null