YouTube Transcript (via DeepAPI, yt-dlp fallback)

Fetch a YouTube video's transcript and save a clean raw .txt file. Primary path is DeepAPI POST /v1/scrape/youtube/transcript. It runs server-side, so it avoids the local-IP bot flagging that plagues yt-dlp.

Save location

• If the user is in a real project/working dir → save there.
• Otherwise (no dir given, or cwd makes no sense) → save to ~/Downloads.
• Always name the file Channel_Title with spaces replaced by _ (e.g. David_Ondrej_title_of_video.txt). If metadata is unavailable, fall back to the video ID.

Primary path — DeepAPI

Read the key from the environment; setup writes it to ~/.deepapi/env. Never source ~/.zshrc (breaks the shell, exit 126):

[ -n "$DEEPAPI_API_KEY" ] || . ~/.deepapi/env
KEY=$DEEPAPI_API_KEY
BASE=${DEEPAPI_API_BASE_URL:-https://deepapi.co}