All output goes to stderr; stdout is always empty

[korya]

Problem

Every line the tool produces — the [.] / [:] / [+] / [-] progress lines, failure dumps, and errors — is written to os.Stderr. Nothing is ever written to stdout.

Reproduction

$ http-assert --assert-ok http://127.0.0.1:8791/ok 2>/dev/null | wc -c
0
$ http-assert --assert-ok http://127.0.0.1:8791/500 2>/dev/null | wc -c
0

Why it matters

http-assert … > run.log captures an empty file, which is surprising. Standard convention is diagnostics on stderr and results on stdout.

Suggested fix

At minimum document the behaviour. Better: send the pass/fail result and the response dump to stdout, keeping only errors and progress chatter on stderr.