Add strict-v2 matched-width bootstrap artifacts

Snapshot strict-v2 frozen 1000/1000 matched-width ablation bootstrap summary (CSV/MD) for the thesis.

thesis_repro/thesis_manu_v2_6_artifacts/strictv2_frozen_1000_matched_width_bootstrap.md

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+# Strict-v2 Frozen (1000/1000): Matched-width ablation bootstrap
+
+- Cohort: `strict_v2_frozen_1000pos_1000neg.parquet` (n=2000, pos=1000, neg=1000)
+- Bootstrap replicates: 3000
+- RNG seed: 20260506
+
+## Calibrated AUROC/AUPRC with 95% bootstrap CI
+
+```
+model,n,pos,neg,polarity_flipped,auroc_raw,auprc_raw,auroc_cal,auroc_ci_low,auroc_ci_high,auprc_cal,auprc_ci_low,auprc_ci_high
+Matched 19-way (identical data build),2000,1000,1000,True,0.2050265,0.3465215110758485,0.7949735,0.7751081587825855,0.8146097202119043,0.7678378185340748,0.7377232586122303,0.7973453020576284
+Matched 7-way (human-lineage subset),2000,1000,1000,True,0.3050870000000001,0.37971448063617946,0.6949129999999999,0.6705866166319159,0.7174001257626609,0.6380884045550511,0.6066584010706604,0.6715196345420191
+Human-only,2000,1000,1000,True,0.4911845000000001,0.4920538388877481,0.5088155,0.4840699050773451,0.534647993706655,0.4986906081870618,0.4712770838201688,0.530499664381583
+```
+
+## Pairwise calibrated deltas (paired bootstrap, two-sided p-values)
+
+```
+model_a,model_b,delta_auroc,delta_auroc_ci_low,delta_auroc_ci_high,p_auroc_two_sided,delta_auprc,delta_auprc_ci_low,delta_auprc_ci_high,p_auprc_two_sided
+Matched 19-way (identical data build),Matched 7-way (human-lineage subset),0.10004751476996922,0.07921782681287966,0.12070681905369475,0.0,0.12886594616836192,0.1012467324412962,0.15642244533906846,0.0
+Matched 7-way (human-lineage subset),Human-only,0.1854035692416717,0.152285453667648,0.21860198980521367,0.0,0.13838192725451404,0.10514443684105644,0.17032459159559243,0.0
+Matched 19-way (identical data build),Human-only,0.28545108401164093,0.2532965553975733,0.31738620224865605,0.0,0.267247873422876,0.23385768260305673,0.29875974659761534,0.0
+```