stacklok / toolhive / 22666181436

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Fix nil pointer panic in resolveTransportType for protocol scheme images (#3944)

Guard against typed nil pointers wrapped in non-nil ServerMetadata
interfaces across all call sites. Protocol scheme images (npx://,
uvx://, go://) returned nil *ImageMetadata from handleProtocolScheme,
which when converted to a ServerMetadata interface became non-nil,
causing panics on method calls like GetTransport().

Fixes #3940

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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