baselines: complete native author-code audit

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+# Native author-code baseline audit
+
+Both records passed the strict C4 artifact, source, protocol, environment,
+dataset, completeness, finiteness, selection, and cost-definition checks.
+These are method-native reproductions, not equal-compute comparisons with SDIL.
+
+| method | reproduced seed | primary test (%) | validation-selected test (%) | test-selected test (%) | published (%) | audited wall (s) |
+|:--|--:|--:|--:|--:|--:|--:|
+| BurstCCN | 0 | 80.070 | 80.100 | 80.250 | 82.97 ± 0.21 | 15451.3 |
+| Dual Prop | 1988 | 92.460 | 92.460 | — | 92.41 ± 0.07 | 23119.8 |
+
+BurstCCN's primary metric is its final epoch. Its validation-selected metric is
+the test accuracy from the minimum-validation-error epoch; its best test value
+is explicitly test-selected because the native trainer evaluates test every
+epoch. The `n_epochs=400` author configuration performs an epoch-0 evaluation
+and 399 optimization epochs. Dual Prop evaluates test once after restoring the
+best-validation checkpoint, so its primary and validation-selected values are
+identical and no test-selected value exists.
+
+The BurstCCN wall value is W&B run time through the final epoch log. The Dual
+Prop wall value sums author-measured train, validation, and final test time and
+excludes setup, checkpoint I/O, and diagnostic plotting. One reproduced seed
+establishes executable fidelity; published multi-seed uncertainty is retained
+for context and is not replaced by a one-seed error bar.