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_gate.yaml

@@ -0,0 +1,28 @@
+# Gate run for the curriculum society (prereg v4 §5). G0 is the decisive one: with a single lineage
+# and no recombination, does cumulative capability CLIMB across generations? If capability cannot
+# accumulate in the simplest arm, no outcome of the full design is interpretable — stop.
+# Also exercises G1 (inheritance transmits), G2 (forgetting occurs without full replay) and, with
+# lineages=3, G3 (recombination combines disjoint knowledge).
+experiment: llm_curriculum_gate
+kind: llm_curriculum
+base_model: Qwen/Qwen2.5-1.5B
+seed: 1
+families: [strings, setops, numtheory]      # 3 families, 3 generations — the smallest climb test
+lineages: 3
+generations: 3
+arms: [isolated, society]
+baselines: []
+n_new: 300
+n_replay: 120
+n_test: 60
+n_val: 30
+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: 32
+batch_size: 32
+train_batch_size: 2
+train_max_len: 448
+lora: {r: 16, alpha: 32}
+output: {dir: results/llm_curriculum_gate}