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mcp: re-list and retry tools/call on HeaderMismatch - #1502
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guglielmo-san
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Sync 6 upstream commits through df0f295: the new ParseURLElicitationRequiredError (modelcontextprotocol#1495), the tools/call retry on HeaderMismatch (modelcontextprotocol#1502), notifications without Mcp-Method (modelcontextprotocol#1504), the cancelable ioConn write lock (modelcontextprotocol#1499), invalid_token in 401 challenges (modelcontextprotocol#1507) and the ioConn frame cap that no longer depends on read boundaries (modelcontextprotocol#1510). modelcontextprotocol#1499 and modelcontextprotocol#1510 are the upstream form of the fork's transport fixes, so ioConn now matches upstream except that canceling a write already in progress still closes the connection, because the peer may hold part of the frame. Upstream's tests replace the fork's duplicates of them; the fork keeps its test for the in-progress cancellation. New pkg.go.dev links in the docs use the fork's module path.
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fixes #1481