docs(examples): add builder-solo — single builder, no adversary (control)
A single Builder that builds AND self-verifies (same DoD rigor), with NO independent Adversary and no claim/review handoff. The control for measuring what the AI adversary costs (its tokens, ~half of a loop-pair run) and buys (independent cold verification vs self-certification). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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