fix(tier3): adapt define/patch to b125 role schema (was model)
Live Worldtree b125 changed POST /agents/define: the request field is now 'role' (a model-role like 'thoughtful-character'), replacing 'model'; the response still echoes it as 'model'. Update define_agent/patch_agent request bodies + CLI (--model -> --role); response parse + LocalAgentEntry unchanged. Verified end-to-end against live (delete->define round-trip); 26 tier3 tests green. Full b22->b125 spec-pin bump remains a follow-up.
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