iso-kl-figure: scaffold + smoke test passing

justfile

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+set shell := ["bash", "-cu"]
+
+default:
+    @just --list
+
+# Smoke: tiny-random Llama, all 3 methods, asserts nonzero KL + branch-pmass changes with coeff.
+smoke:
+    BEARTYPE=1 uv run --extra all pytest -q tests/test_smoke.py
+
+test:
+    uv run --extra all pytest -q
+
+# Run one (model, method, seed, window) cell end-to-end (calibrate + trajectory + pmass).
+cell model="Qwen/Qwen2.5-0.5B-Instruct" method="mean_diff" seed="0" window="50":
+    uv run --extra all python scripts/run_cell.py \
+        --model {{model}} --method {{method}} --seed {{seed}} --window {{window}}
+
+# Sweep model x method x seed x window cells.
+sweep:
+    bash scripts/sweep.sh
+
+# Aggregate all outputs/<run_id>/ into figs/figure1.png + figs/table.md.
+aggregate:
+    uv run --extra all python scripts/aggregate.py --runs-root outputs --out figs