These skills require heavy GPU/CUDA stacks or are niche enough that they shouldn't
be active by default. Moved to optional-skills/ where users opt-in via
`hermes skills install official/...`.
Moved:
- mlops/training/axolotl
- mlops/training/trl-fine-tuning
- mlops/training/unsloth
- mlops/inference/outlines
Counts: 91 -> 87 built-in, 72 -> 76 optional.
Auto-regenerated docs (per-skill pages + catalogs) reflect the move.
