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- Add `eval/layer_module_ablation.py` (T7) and `eval/parameterization_ablation.py` (T8) for causal ablation of trained `dW`. - Add `nbs/ablation_analysis.py` consuming T7/T8 CSVs through three lenses (SVD-on-`dW`, layer index, module family). - Fix `prompt_baseline.py` engineered-prompt tuple bug; add `DIFF_FILENAME` constant in `diff.py`. - Delete superseded notebooks (`analyze_diff*`, `cross_adapter_v9`, `hypothesis_sweep_v5-v9`, `strong_conclusion_v4`, `v10_llama`, `functional_projection_v10`). - Document (README, fork_plan, RESEARCH_JOURNAL): each lens has a built-in failure mode (SVD tautological for low-rank adapters; layer-index tells depth not mechanism; module-family disagrees cross-adapter; native parameterization decompositions non-comparable). Mark analysis question on hold pending T4 multiseed: cross-adapter inconsistency may be N=1 seed noise. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>