ablation: add Group A (aggregator) + Group B (architecture) infrastructure
Extends MixedCFMConfig with 5 backwards-compatible flags (use_flow_token,
n_packet_tokens, disc_as_cont, cont_as_disc + cont_n_bins) so existing
JANUS-full checkpoints load with 0 missing/unexpected keys.
Adds:
- 60 ablation training configs (5 variants × 4 datasets × 3 seeds)
- scripts/ablation/{generate_configs.py, run_groupB.sh, run_cross_groupB.sh,
smoke_test.sh} — config generation + GPU drivers
- scripts/aggregate/aggregate_ablation{,_cross,_cross_B}.py — produces
within-dataset and cross-dataset (3×3) ablation tables with 3-seed mean
± 95% t-CI plus optional paired DeLong p-values
README updated with ablation section pointing at
artifacts/ablation/ABLATION_SUMMARY.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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