Runs a structured, deterministic implementation workflow via the installed slopshipper CLI: clarifies intake, gates human release, runs build and verify, records independent review evidence, and delivers a reviewed artifact. Use when the user says /slopshipper, run this plan, execute the task list, ship this in slices, implement with checkpoints, walk the plan end to end, build it with human gates, or do a governed multi-step implementation. Do not use for ad-hoc edits or planning-only work.