build — implement spec Single-thread native plan→execute. You are main Claude. No swarm. LOAD 1. Read . If missing → tell user to invoke the spec skill first. Stop. 2. Read once if not loaded. 3. Parse invocation args: - → that task only - → lowest-numbered row with status or - or empty → every row in §T order PLAN Native plan mode. For chosen task(s): 1. Cite every §V invariant that applies. Plan must respect all. 2. Cite every §I interface touched. Plan must preserve shape. 3. List files to create / edit. 4. List tests to add or update (one per invariant touched). 5. Name verification comma…