[
  {
    "_note": "Single-eye + all_losses + Hadamard FusionBridge. Pairs with the in-flight ensemble_single_refugelike (single+BCD+Hadamard) to isolate the BCD-vs-all-losses effect. v3 phase 3 originally showed BCD generalizes better; this re-establishes it in v4.",
    "run_name": "experiments/phase3_v4/single_all_losses_hadamard",
    "reps": 10,
    "overrides": {
      "training": { "tower_loss_mode": "all_losses" }
    }
  },

  {
    "_note": "Single-eye + BCD + ConcatBridge. Pairs with in-flight baseline (single+BCD+Hadamard) to isolate the bridge effect. Justifies why we use FusionBridge (Hadamard) as default.",
    "run_name": "experiments/phase3_v4/single_bcd_concat",
    "reps": 10,
    "stage_overrides": {
      "nt": {
        "module": "v4.classes.bridges.concat_bridge",
        "class":  "ConcatBridge",
        "args":   { "fusion_dim": 256 }
      }
    }
  },

  {
    "_note": "Single-eye + all_losses + ConcatBridge. Fourth cell of the BCD-vs-all-losses × Hadamard-vs-Concat 2x2.",
    "run_name": "experiments/phase3_v4/single_all_losses_concat",
    "reps": 10,
    "overrides": {
      "training": { "tower_loss_mode": "all_losses" }
    },
    "stage_overrides": {
      "nt": {
        "module": "v4.classes.bridges.concat_bridge",
        "class":  "ConcatBridge",
        "args":   { "fusion_dim": 256 }
      }
    }
  }
]