[codex] Add diagnostic AI priority subset

[dragon-ai-agent]

Summary

This PR adds a lightweight MONDO representation for the rare disease diagnostic AI prioritization artifact described in #10364.

Changes:

• Adds subset definitions for diagnostic-AI-prioritized rare diseases.
• Adds rare_disease_ai_diagnostic_priority and rare_disease_ai_diagnostic_priority_initial subset membership to 427 active MONDO terms from the companion initial disease list.
• Adds IAO:0000233 tracker links to Add MONDO subset for rare diseases prioritized for diagnostic AI development #10364 on the annotated active terms.

The companion YAML has 431 initial MONDO IDs. Four are obsolete in this checkout and were intentionally left unannotated rather than inferred/remapped:

• MONDO:0013935 obsolete Usher syndrome type 1J, replaced by MONDO:0012273
• MONDO:0020732 obsolete progeria, replaced by MONDO:0015333
• MONDO:0700294 obsolete CTCF-related neurodevelopmental disorder, replaced by MONDO:0014213
• MONDO:0800029 obsolete interstitial lung disease 2, consider MONDO:0800497 and MONDO:0800504

Sources:

• Version DOI: https://doi.org/10.5281/zenodo.20520796
• Concept DOI: https://doi.org/10.5281/zenodo.19489581
• Companion site: https://monarch-initiative.github.io/rare-disease-identification/
• Companion data repository: https://github.com/monarch-initiative/rare-disease-identification

Part of #10364.

Validation

• Extracted 431 unique initial IDs from the companion YAML.
• Verified 427 active IDs have both subset tags and the Add MONDO subset for rare diseases prioritized for diagnostic AI development #10364 tracker after normalization.
• Verified the 4 obsolete IDs remain unannotated.
• Ran sh run.sh make NORM && mv NORM mondo-edit.obo from src/ontology.
• Ran robot convert --catalog src/ontology/catalog-v001.xml -i src/ontology/mondo-edit.obo -f obo -o mondo-edit.TMP.obo.
• Ran git diff --check.