steam_not_running, steam_not_responding, steam_js_error and artwork_failed
for the Frame-side Steam client script (its "Connection refused" and
"timed out" were filed as frame_unreachable), copy_timeout and copy_failed
for rsync/scp, internal_error for Python's own errors (KeyError,
JSONDecodeError, ...) whatever they say, and apk_unreadable now covers
every frame_apk.ApkError wording. docs/privacy.md lists them all, and a
test keeps it in sync.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
