The MCP Profile schema declares additional_email_addresses as a
required, non-nullable array, but NewProfile passed the mail.Addrs
value through unchanged. A profile with no extra emails has a nil
slice, which marshals to JSON null and fails tool output validation
with "type: null, want array".
Default the nil slice to an empty mail.Addrs so the marshalled output
always honors the strict array schema.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
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