Add local YouTube publishing preparation skill

[sfc-gh-cnantasenamat]

Summary

Video publishing preparation should deliver usable copy, not just links to output files. This skill prepares transcript-grounded YouTube titles, descriptions, keywords, word-aligned chapters and verified official documentation for existing English-language Snowflake or Streamlit videos. Its final response includes the full publishing content and a linked inventory of generated artifacts.

• Runs transcription, forced alignment and copy generation locally with FFmpeg, Whisper, WhisperX and a loopback-only Ollama endpoint. Media and transcripts are not sent to cloud inference services, and nothing is published to YouTube.
• Resolves chapter times from explicit word IDs, retains uncertain alignment flags, and distinguishes timestamp storage precision from acoustic accuracy. Requires semantic review in addition to structural checks.
• Uses portable paths, optional Python dependencies, bundled scripts/tests and the Snowflake Skills License. Local environments, model weights and video artifacts are excluded.

Example prompt

$video-publishing-prep Prepare YouTube metadata for /absolute/path/tutorial.mp4

Test plan

• 16 standard-library unit and synthetic workflow tests passed, including exact chapter resolution, rejected flagged anchors, resource rendering, artifact preservation and remote-model rejection.
• YAML frontmatter and TOML parsed; required contribution fields and title/summary limits checked.
• Repository validator returned no errors; git diff --check passed.
• Reviewed for personal paths, credentials, media artifacts and bundled-skill naming conflicts; public duplicate searches found related tools but no close duplicate.
• Original local workflow exercised on a real video before packaging, with transcription, alignment, local generation, editorial review and resource verification.
• Fresh-environment full-media run of this portable package. Tests do not prove acoustic accuracy or model-output quality.

Review notes

• status: Published follows the current CONTRIBUTING.md and existing published skills. The older validator recommends stable/beta/draft and emits a non-blocking warning. Both name/author and id/authors metadata are supplied.
• English alignment only; models and system executables must be available locally. Package/model installation requires approval. Large transcripts require section-wise generation rather than silent truncation.
• Pre-PR review was advisory. The contributor confirmed the employee contribution requirements and license choice before submission.

Generated with Snowflake CoCo

[snowflake-security-bot]

Snowflake Security Review

Security grade: A — Passed ✅

This PR was classified as LOW risk by the automated pre-screen.

[sfc-gh-cnantasenamat]

Superseded by #98, which includes the renamed tutorial-video-publishing alongside tutorial-video-editor and tutorial-video-thumbnail in one coordinated submission. Closing this standalone PR; branch retained.