Guide: name @modelcontextprotocol/express in the server-author row, say
the two SDKs share no types rather than "do not interoperate" (they speak
the same wire protocol), note zod 4.0/4.1 lack ~standard.jsonSchema, list
the full 1.x-shaped extra, cover tool callbacks in the handler-context
bullet, document that the double-registration guard now covers the base
Protocol's notifications/progress and notifications/cancelled handlers,
mention ResourceNotFoundError, add the Express row to the import map, and
add a "What stays the same" section.
The @deprecated tag on the legacy setRequestHandler / setNotificationHandler
overload sat on the parameter inside an intersection type, which TypeScript
does not report. The overload now comes from LegacyRequestHandlerSetter /
LegacyNotificationHandlerSetter, named types with a documented call
signature, so editors flag the 1.x call and not the 2.x forms.
README links to the quickstart use the lowercase slug typedoc emits.
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