docs: add sanitized metastability evidence plot

README.md

@@ -80,7 +80,7 @@ intended 25-50% yield, and later cohorts did not fully verify its recurrence. A
 broader 512-candidate screen converged 58/512, had weighted mean hull 1.2330
 eV/atom, and produced no M.S.U.N. candidates.
 
-![Historical stability evidence](figures/nexamat_metastability_evidence.png)
+![Historical stability evidence](figures/nexamat_metastability_evidence.svg)
 
 See [`eval/FINAL_EVIDENCE_SUMMARY.md`](eval/FINAL_EVIDENCE_SUMMARY.md) for the
 full public evidence table and the comparability limits between evaluation

file_manifest.json

@@ -3,7 +3,7 @@
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@@ -52,9 +52,9 @@
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