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_g2.yaml

@@ -0,0 +1,27 @@
+# G2 probe (prereg v4 §5): does forgetting occur AT ALL under the real curriculum length?
+# The 3-family gate showed none — but with only 3 families, ample adapter capacity and a generous
+# replay budget, none was expected. This runs the full nine-family curriculum on ONE lineage with
+# replay switched OFF, which is the harshest condition the design can offer. If early families still
+# do not decay, the families are too mutually compatible and too easy for their own good, and the
+# society has no forgetting to rescue — a design-level stop.
+experiment: llm_curriculum_g2
+kind: llm_curriculum
+base_model: Qwen/Qwen2.5-1.5B
+seed: 1
+families: [strings, setops, numtheory, mixedtoken, digits, alphabet, prime, wordlen, roman]
+lineages: 1
+generations: 9
+arms: [isolated]
+baselines: []
+n_new: 300
+n_replay: 0             # replay OFF — the harshest forgetting condition
+n_test: 60
+n_val: 30
+epochs: 3
+lr: 1.0e-4
+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_g2}