Add experimental Server Card extension support (SEP-2127)#2527

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feat/experimental-server-card

Commits on Jul 21, 2026

feat(core): add experimental Server Card and AI Catalog schemas (SEP-2127)
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feat(server): serve Server Cards and AI Catalogs from web-standard hosts
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feat(client): hardened Server Card discovery, resolution, and reconciliation
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feat(express): mcpServerCardRouter adapter for the Server Card responders
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test: pin the new experimental export-map keys and add a discovery integration test
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docs: Server Cards guide page with a runnable snippet companion
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examples: server-card-discovery story
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changeset: experimental Server Card extension support
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fix(client): correct Server Card discovery guard and error semantics
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fix(server), test, docs: Server Card review polish
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