Add skill management commands and interactive REPL support:
CLI commands (cmd/skill_cmd.go):
ollama skill push NAME PATH - Push skill to registry
ollama skill pull NAME - Pull skill from registry
ollama skill list - List installed skills
ollama skill show NAME - Show skill details
ollama skill rm NAME - Remove a skill
Skill loading (cmd/skills.go):
- Load skills from model manifests
- Parse SKILL.md frontmatter for metadata
- Inject skill instructions into system prompt
- Provide run_skill_script tool for script execution
Interactive mode (cmd/interactive.go):
/skills - Show available skills
/skill add PATH - Add skill from local path
/skill remove NAME - Remove skill from session
/skill list - List session skills
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