feat(mcp): structured AuthError for 401 responses#47
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Captures status code + WWW-Authenticate + resource_metadata URL on 401, wraps in *AuthError, propagates via errors.As back to fc-safari through new ErrorType / AuthMetadata fields on MCPResultPayload. Old MCPResult senders omit the new fields — fc-safari falls back to opaque-error path.
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Summary
Captures 401 status +
WWW-Authenticate+resource_metadataURL on remote MCP server responses, wraps in*AuthError, surfaces to fc-safari via new additive fields onMCPResultPayload.What's in this PR
mcp/auth_error.go—AuthErrorstruct +errors.Unwrapsupportmcp/transport.go::headerTransport.RoundTrip— 401 capture + WWW-Authenticate parserprotocol/messages.go::MCPResultPayload— additiveErrorType+AuthMetadatafieldsws/handler.go::handleMCPCall— populates new fields when error is*AuthErrorCompanion PRs
Part of cross-repo per-user auth work — see fc-safari, fc-event, go-pkg, ai-sre-web, fc-foundation-app.
Test plan
go test ./mcp/ -run TestRoundTripWrapsAuthError -v— PASSgo test ./... -count=1— no regressionsgo build ./...clean