claude/discordo-plus @ b5ba2919d75d2c6d935d36fc122f1066793aa4db

claude 2a99ad6241 fix: implement low-risk security, quality, and infra fixes from audit		hai 1 mes
..
client.go	69d3f81c89 fix(http): create new http.Client instead of mutating default	hai 1 mes
headers.go	6972ac6cb2 fix(http): log when getSuperProps fails	hai 4 meses
props.go	f42884ec07 refactor(http/props): move client_build_number to const	hai 4 meses
transport.go	2a99ad6241 fix: implement low-risk security, quality, and infra fixes from audit	hai 1 mes