Add host-side canvas declaration API and canvasProvider to Java SDK#1848

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jmoseley-java-canvas-host-api

Commits on Jun 30, 2026

Add host-side canvas declaration API and canvasProvider to Java SDK

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Reply with canvas error when canvas callback fails synchronously

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Commits on Jul 1, 2026

Merge remote-tracking branch 'origin/main' into jmoseley-java-canvas-host-api
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