Manuscript revision and pending experiment work, snapshot before restructuring

Clarity pass over the main text (36-item audit), Discussion rewrite and cut,
acknowledgements, Souly et al. as ref 62, lettered SI panels, model section
moved under Results; plus the untracked curriculum/society/compose/smol
configs, runners, figures, stats and tests that the SI already cites.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y64o8FKP7rCuXzC48pxpMm

configs/llm/curriculum_v5_veto.yaml

@@ -0,0 +1,31 @@
+# The veto arm (GG, 2026-09-08): identical to v5's `society` arm in every respect except that
+# "keep the parent unchanged" is an admissible offspring. v5 made merging obligate — every lineage
+# merged every generation and had to accept the result, which is not what anyone would build.
+#
+# Reference points from v5 seed 1: society 0.211 (obligate merging) vs isolated 0.814 (never merges).
+# The diagnostic that matters is `veto_used`: if lineages decline every merge the arm degenerates to
+# `isolated`, and that is itself the answer.
+experiment: llm_curriculum_v5_veto
+kind: llm_curriculum
+base_model: Qwen/Qwen2.5-1.5B
+seed: 1
+families: [mnli, arc, hellaswag, squad, boolq, winogrande]
+lineages: 3
+generations: 6
+arms: [society]
+baselines: []
+allow_veto: true
+n_new: 300
+n_replay: 150
+n_test: 60
+n_val: 20
+epochs: 3
+lr: 1.0e-4
+operator: linear
+merge_weights: [[0.5, 0.5], [0.3, 0.7], [0.7, 0.3]]
+max_new_tokens: 48
+batch_size: 24
+train_batch_size: 2
+train_max_len: 512
+lora: {r: 16, alpha: 32}
+output: {dir: results/llm_curriculum_v5_veto}