main: keep only what reproduces the manuscript; everything else lives on dev

Removed from main (all preserved on the dev branch): the arXiv build and
its sources, design documents (blueprint, results summary, review responses,
essay drafts), tasks/ and CLAUDE.md, the cover letter and reference tooling,
two unused manuscript figures, and every experiment that feeds no figure or
number in the paper: the collapse null, the sexual-vs-asexual lineage, the
NK speciation variant, the 0.5B single-seed LLM prototypes, the compose and
society experiments with their calibration and pilot runs, and their
configs, runners, tests, figure scripts and PBS jobs. Their result bundles
are moved to results/_archive/ (ignored) so the parquets stay on disk.

Also: plot_llm_speciation reads the s{seed}/ layout; the mating-breadth
plot writes under its bundle name; Makefile targets reduced to the kept
experiments; REPRODUCING.md and README point to dev for the rest.

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

REPRODUCING.md

@@ -53,8 +53,7 @@ make test            # correctness + closed-form scientific validation
 make inheritance     # the inheritance model, every experiment at its committed seed
 make neural          # trained networks (needs a GPU)
 make mnist           # real-MNIST tier + the Fig. 2A montage asset (needs torchvision)
-make llm             # language-model prototypes (needs a GPU)
-make llm-seeds       # the multi-seed firm-ups behind Fig. 3B
+make llm             # the 0.5B multi-seed language-model runs behind Fig. 3B (needs a GPU)
 make llm-epistasis   # the controlled predictive test behind Fig. 3D-E
 make llm-speciation  # the LLM speciation tier behind Fig. 5C-D
 make figures         # per-experiment figures, from committed parquets (no re-simulation)
@@ -210,5 +209,5 @@ qsub hpc/llm_7b_seeds.pbs   # seeds 2-3 of the three 7B experiments (array)
   paper's "regenerates from committed artifacts without re-simulation" holds from the archive.
 - `figures/mnist_montage.py` re-runs a short dry lineage to draw its montage rather than reading a
   parquet; it is an eyeball diagnostic whose quantitative counterpart is `results/fig2_mnist_collapse/`.
-- The composed society at language-model scale is an open experiment at the time of writing; see
-  `tasks/workorder-llm-society.md`.
+- The composed society at language-model scale is an open experiment at the time of writing; its
+  configs, pilots and pre-registration are on the `dev` branch.