feat(a2ui): advertise client capabilities through the transports - #822
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@threadplane/langgraph gains AgentOptions.a2uiClientCapabilities (merged into plain-object run payloads as a2ui_client_capabilities, mirroring client_tools); @threadplane/ag-ui seeds the same key into shared state via ToAgentOptions; threadplane-middleware adds the a2ui_client_capabilities(state) reader for graphs. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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A2UI v0.9 catalog-negotiation metadata, follow-up to #817–#820:
@threadplane/langgraphgainsAgentOptions.a2uiClientCapabilities(merged into plain-object run payloads asa2ui_client_capabilities, mirroringclient_tools— null/command-resume payloads pass through, thread state persists it for later runs);@threadplane/ag-uiseeds the same key into AG-UI shared state viaToAgentOptions;threadplane-middlewareadds ana2ui_client_capabilities(state)reader so graphs can gate A2UI emission on what the renderer supports. Opt-in on both transports (no payload change unless configured). Tests: langgraph 58 (client-tools spec incl. 4 new), ag-ui 68 (2 new), middleware 37 (2 new); lint/test/build green for both libs; api-docs regenerated.🤖 Generated with Claude Code