Add DOI to README and page footer

README.md

@@ -12,6 +12,8 @@ short_description: Lifting self-correction 50%→92.9% under a noisy notebook
 
 # External Grounding — interactive demo
 
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.21845022.svg)](https://doi.org/10.5281/zenodo.21845022)
+
 Interactive visualization of Experiment 2–3 (the *guardian*) of the
 [Second Loop](https://github.com/SergheiBrinza/external-grounding) project.
 

index.html

@@ -370,6 +370,7 @@ input[type=range].lever-input:focus-visible::-moz-range-thumb{box-shadow:0 0 0 4
       Wikipedia retrieval + 7B reader/judge (both Apache-2.0, Alibaba Cloud). Wikipedia content
       © its authors, CC BY-SA. Run on a single RTX 3090 Ti. No model weights are redistributed here —
       only aggregate verdicts and counts. Demo code & data: MIT.
+      Paper: <a href="https://doi.org/10.5281/zenodo.21845022" target="_blank" rel="noopener">doi.org/10.5281/zenodo.21845022</a>.
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