Each gate’s mixed run delegates 25% of turns, three wide, two deep

The default delegation mix of every gate’s mixed run: 25% of turns delegate, 3 concurrent sub-agents, depth at most 2 — a setting (UR-05); the fanout mix stresses wider trees separately (SCALE-AGENTS).

Provenance: technical default selected by the coordinator, described in the original conversation at line 5525 (2026-10-01), not an option accepted by the user in answer 5469. The later storage/durability approval at 5760 does not retrospectively turn this selection into a direct user answer.