fix(node): log a subtitle request before the cache answers it

A cached track replied without leaving a line, so the journal showed nothing
for a viewer who had asked for subtitles and been served instantly. That made
"no request in the log" look like evidence nobody had asked — which it was not
entitled to be, and which cost a wrong conclusion about whether a fix had been
exercised at all.

The request is logged on arrival now, before the cache is consulted, and a
cache hit says so with the size it served. Second time in this feature that a
silent success was read as an absence; the first was an attach-time state that
was correct while the screen stayed empty.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc

0 files changed, 0 insertions, 0 deletions