Closes finding [using-yt-tools-frames-multiline-stdout]: the previous
"Last line каждого CLI's stdout — absolute path артефакта" wording matched
yt-transcript / yt-watch reality but quietly misled callers about yt-frames,
which emits one ``Wrote: <abs path>`` line per extracted frame (designed
that way per ``yt_tools/frames.py`` docstring so streaming consumers don't
have to parse a trailing summary; ``tests/test_cli_smoke.py:81`` enforces
the prefix).
Chose spec-fix over code-fix: changing yt-frames to bare paths would break
the existing piping/scraping contract — bigger surface than the docs typo
this finding actually is. SKILL.md now spells out per-CLI stdout shape and
notes warnings/errors go to stderr.
PATCH (wording clarification, no behavior change).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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