feat(ponytail): custom skills system + mode shortcuts

[getappz]

• Load custom .md skills from ~/.config/agentflare/ponytail/skills/
• LazyLock static cache, loaded once at first access
• get_custom(name) for programmatic lookup
• Mode shortcuts: /ponytail-ultra, /ponytail-lite as aliases
• Custom skill names integrated into switcher and instructions
• Build checks custom skills before embedded fallback
• Closes ponytail PR audit ticket [ponytail#397] Custom skills + mode shortcuts: user-defined skill variants #76

Summary by CodeRabbit

• New Features

  • Added support for user-defined custom skills alongside built-in ones.
  • Expanded shortcut handling so more mode and skill names can be recognized from the command prefix.

• Bug Fixes

  • Improved skill selection when no explicit skill path is provided, making fallback behavior more reliable.
  • Enabled additional mode shortcuts like /ponytail-ultra and /ponytail-lite.

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📥 Commits

Reviewing files that changed from the base of the PR and between 05263fa and 51c693c.

📒 Files selected for processing (3)

• crates/ponytail/src/instructions.rs
• crates/ponytail/src/sub_skills.rs
• crates/ponytail/src/switcher.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/custom-skills

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[getappz]

Manually merged — rebased onto current master