feat(mcp): upgrade to MCP 2026-07-28 spec#32
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Add spec2026Handler middleware for server/discover, Mcp-Method/Mcp-Name routing headers, cache hints on list/read responses, JSON Schema 2020-12 injection on tools/list, and external $ref rejection at registration. Stateless transport strips Mcp-Session-Id after delegate. Closes kiwifs#424
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Summary
Add MCP 2026-07-28 Streamable HTTP transport compatibility layer around the existing stateless handler:
server/discover— dynamic capability discovery withttlMs/cacheScopeMcp-Method/Mcp-Nameheaders — validated on request when present; emitted on all JSON responsesttlMsandcacheScopeinjected ontools/list,resources/list,prompts/list, andresources/read$schemadraft 2020-12 URI injected on tool input/output schemasWithStateLess(true)+ stripMcp-Session-Idafter delegatehttp(s)://$refURIs at tool registrationinitializeworks for 2024-11-05 clientsBumps
github.com/mark3labs/mcp-gov0.49.0 → v0.55.1.Upstream: kiwifs#424
Test plan
go test ./internal/mcpserver/ -count=1go test ./internal/api/ -run MCP -count=1go test ./tests/ -run MCP -count=1Closes kiwifs#424