Pin the contract from plan-v2 Steps 1-3: every agents/*.md must declare
model: (opus|sonnet|haiku) AND (tools: or disallowedTools:). Orchestrators
(planning/research/review) must be opus and include the Agent tool;
non-orchestrators must not include Agent (no recursive swarming).
23 agents in scope; 5 pinning tests.
[skip-docs]
