clean up main

cmd/cgat/main.go

lib/bouncer/frontends/v0/accept.go

lib/gat/pool.go

lib/gat/pooler.go

lib/gat/pools/session/pool.go

lib/gat/pools/transaction/conn.go

lib/gat/pools/transaction/pool.go

lib/gat/pools/transaction/work.go

lib/middleware/interceptor/interceptor.go

lib/zap/reader.go