v0.5.0 - Skill Support

Added

• Skill support - Agents can declare skills in frontmatter that get injected into system prompts
  • Agent frontmatter: skill: tmux, chrome-devtools (comma-separated)
  • Runtime override: skill: "name" or skill: false to disable all skills
  • Chain-level skills additive to agent skills, step-level override supported
  • Skills injected as XML: <skill name="...">content</skill> after agent system prompt
  • Missing skills warn but continue execution (warning shown in result summary)
• TUI skill selector - Press [s] to browse and select skills for any step
  • Multi-select with space bar
  • Fuzzy search by name or description
  • Shows skill source (project/user) and description
• Parallel task skills - Each parallel task can specify its own skills via skill parameter

Fixed

• Chain summary formatting (extra blank line when no skills)
• Duplicate skill deduplication
• Consistent skill tracking in async mode