Add new regression and ensemble experiment configurations for V2-M and OrthoBridge

- Introduced multiple regression experiment configurations targeting vf_md, including:
  - cd_solo_reg_set.json: CD tower only regression setup.
  - img_solo_reg_set.json: Image tower only regression setup.
  - reg_head_epoch_sweep.json: Baseline regression sweeps at different epochs (50, 75, 100).
  - reg_head_set.json: Various regression setups including baseline and OrthoBridge configurations.
  - single_eye_reg.json: Single-eye regression setup for worst-eye aggregation analysis.

- Added ensemble configurations for OrthoBridge with different inner bridges:
  - ortho_alts_ensemble.json: Ensemble tests with ConcatBridge, PairwiseAdditiveBridge, and GatedAdditiveBridge.
  - ortho_alts_tritower.json: Tritower tests with the same inner bridges.

- Created V2-M specific configurations:
  - baseline_reg_nt50.json: Regression baseline with V2-M backbone.
  - geom_vec_gt.json and geom_vec_unet.json: Geometry vector injection experiments with V2-M.
  - single_l1_bridges.json: Single-eye ensemble experiments with various bridge types.
  - tritower_geom_gt.json: Tritower setup with GT contour-rasterized masks.

- Promoted existing experiments to higher repetitions for robustness.

v4/figures/run_F8_fusion_and_gradcam.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")/../.."
+
+PYTHON_BIN="${PYTHON_BIN:-/home/rpotter/miniconda3/envs/fundus_imaging/bin/python}"
+export MPLCONFIGDIR="${MPLCONFIGDIR:-/tmp/mplconfig}"
+
+FUSION_SPLIT="${FUSION_SPLIT:-test}"
+GRADCAM_GRID="${GRADCAM_GRID:-16}"
+GRADCAM_ALPHA="${GRADCAM_ALPHA:-0.45}"
+
+FUSION_SOURCE="${FUSION_SOURCE:-v3}"
+GRADCAM_SOURCE="${GRADCAM_SOURCE:-v3}"
+
+echo "Running F8a fusion event panel from ${FUSION_SOURCE} ${FUSION_SPLIT} predictions..."
+"${PYTHON_BIN}" -m v4.figures.F8_explainability \
+  --only-fusion \
+  --fusion-source "${FUSION_SOURCE}" \
+  --fusion-split "${FUSION_SPLIT}"
+
+echo "Running oriented GradCAM outputs from ${GRADCAM_SOURCE}..."
+"${PYTHON_BIN}" -m v4.figures.F8_explainability \
+  --only-gradcam \
+  --gradcam-source "${GRADCAM_SOURCE}" \
+  --n-grid "${GRADCAM_GRID}" \
+  --alpha "${GRADCAM_ALPHA}"