[codex] Restore transcript package and output directory

[ahassoun]

Summary

• Restore the deleted output/digital_transformation_with_eric_kimberling directory from the last known-good output commit.
• Restore the tracked src/scrapling_cli package after the latest main removed it while wrappers/tests still depended on it.
• Integrate transcript-provider handling so YouTube transcript API provider-block errors fall through without retrying the same backend, and cached unavailable transcript results are retried during live regeneration.

Validation

• .venv/bin/python -m compileall src scrapling_cli.py fetch_new.py tests
• .venv/bin/python -m pytest (25 passed, 1 skipped)
• .venv/bin/python scrapling_cli.py --help
• .venv/bin/python fetch_new.py --help

Live generation note

• IBM Technology regenerated successfully with 26/26 selected transcripts available, but generated output was not committed because the second channel was blocked.
• Digital Transformation with Eric Kimberling hit provider blocking: youtube-transcript-api reported YouTube IP blocking, yt-dlp returned HTTP 429, and OpenAI ASR was unavailable because OPENAI_API_KEY is not set.
• Per the blocker rule, no partial regenerated output commit is included.