Drift audit: pin/spec/version drift detected

[displayxr-publish-bot]

Automated cross-repo drift audit (scripts/drift_audit.py, epic #691 / #695).

• stale-pin: pins displayxr-mcp @ v0.5.3 but latest tag is v0.5.4
• openxr-version-drift: XR_CURRENT_API_VERSION=1.1.63; majority is 1.1.51 (displayxr-demo-avatar=1.1.51, displayxr-demo-earthview=1.1.51, displayxr-demo-gaussiansplat=1.1.51, displayxr-demo-mediaplayer=1.1.51, displayxr-demo-modelviewer=1.1.51, displayxr-runtime=1.1.63)

Re-run scripts/drift_audit.py after fixing to clear this issue.