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15802c37fb
* fix(mcp): keep grant_type authoritative over extra_token_params
_fetch_token built the token request body as
{"grant_type": oauth.grant_type, **oauth.extra_token_params}, so an
operator-supplied extra_token_params that happened to contain
"grant_type" silently overwrote the value sent to the token endpoint
while the branch logic below still keyed off oauth.grant_type — the
sent grant_type and the chosen auth flow would disagree, and the
provider would almost certainly reject the request.
Spread extra_token_params first and set grant_type (and the other
reserved fields, which were already set after the spread) afterward, so
operator-supplied params can populate arbitrary extra fields but never
override the reserved ones the flow depends on.
* test(mcp): cover extra OAuth token parameters
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>