Run 197's riscv64 failure (#131) could only be read from the run's logs
artifact, which Gitea's API does not list. qemu_session.py's check() now
prints, on a FAIL, the serial lines after the first match of an anchor the
check names, or the log's last lines; control characters as escapes, so a
stray byte or terminal sequence in a line shows instead of only failing a
match. The boot-disk checks anchor on 'Boot successful!'. A passing run
prints as before (riscv64 here, logs/ committed).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2
