build — implement spec

Single-thread native plan→execute. You are main Claude. No swarm.

LOAD

1. Read SPEC.md. If missing → tell user to invoke the spec skill first. Stop.
2. Read FORMAT.md once if not loaded.
3. Read §R if present — external facts the build must honor, ⊥ re-derive or contradict.
4. Parse invocation args:
   • §T.n → that task only
   • --next → lowest-numbered row with status . or ~
   • --all or empty → every . row in §T order

High blast radius (shared module, auth, data, money, public §I)? Run /review first. Trivial & reversible? Skip planning ceremony, just do step EXECUTE.

PLAN

Native plan mode — you delegate to it, you do not reinvent task breakdown. For chosen task(s):