Crew lab: three roles, three worktrees, one writer

Build lab (Module 9, L9.7, the module close): three roles, three worktrees, one writer. The doctrine-free crew shares one checkout and finishes with 2 authors, 0 refused writes, 1 verdict.md on main and 1 merge conflict on utils.py. The wired crew commits the brief on main (FNV-1a fingerprint abbcac62), keeps 1 author on the feature branch, refuses 1 reviewer write, passes 3/3 checks, and fails the planted extra file 1 time. A clean --no-ff merge has 0 conflicts, verdict.md on main 0, and 2 merge parents, and slugify lands. The brief then moves to fingerprint 19e8d581 and the hash gate blocks 1 time; APPROVED alone blocks 0. A shared checkout refuses 0 writes. Letting the reviewer commit puts 2 authors on the branch. In-memory commits only; no git binary, threads, model or provider call.

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