Initial release of training-content-extractor skill.

- Extracts structured enterprise training outlines from pasted transcription text (modules → lessons → key points → cases → exercises → assignments).
- Supports step-by-step expansion of each lesson into detailed training documents.
- Offers three output modes: outline, lesson expansion, and compilation into long-form documents.
- Includes workflows for cleaning transcription, identifying structure, extraction, and document assembly.
- Enforces constraints such as no fabrication, source attribution, actionable assignments, and segmented output to avoid excessively long text.
- File structure separates instructions, templates, and sample outputs for clarity and maintainability.