Add canvas extensibility support#1372

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jmoseley/canvas-runtime-support

Commits on May 21, 2026

Canvas extensibility V1 (Rust snapshot from github-app vendor)

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Canvas extensibility V1.1: SDK additive types + dispatch wiring

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Canvas V1.1: drop HostCapabilitiesConfig (renamed to requestCanvasRenderer upstream)

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Canvas V1.1: Node SDK createCanvas factory + canvases declaration wire-up

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Phase 4: delete legacy HostedExtension surface

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fix(rust): preserve canvases on session.create/resume wire payload

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feat: add requestExtensions session-level opt-in

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Add required instance_id to CanvasOpenContext (Rust + Node)

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Fix Node SDK host extension envelope shape

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Commits on May 22, 2026