implement

Plan and run parallel implementation of roadmap epics — the parallel build-execution entry point. Triggers on 'run agents in parallel', 'implement the backlog in parallel', 'parallel implementation', or 'ship epics to PR in parallel'. Computes a dependency-ordered wave plan via the disjoint-epic decomposer, proposes it for approval, then dispatches one agent per epic in an isolated git worktree, gates each via the independent lsa:reconcile + the .lsa.yaml gate: checks, and converges via the serialized merge. Honors the .lsa.yaml autonomy ladder (manual = human merges · semi = auto-merge on green · auto = + deploy + healthcheck; default manual). Input: [epics] (slug/path list) + optional --parallel / --sequential; the no-arg form is a read-only preview of parallelizable backlog items. Output: an approved wave plan, per-epic worktree/PR dispatch, and a gate-proven roll-up (merged @ <sha> / deployed reported only when the gate proved it). Reads ${specs_root}/roadmap.yaml.