Add a proper `gt formula` command with subcommands:
- gt formula list - List available formulas
- gt formula show <name> - Display formula details
- gt formula run <name> - Execute a formula (scaffold for gt-574qn)
- gt formula create <name> - Create new formula templates
The create command generates valid TOML templates for:
- task: Single-step task formula
- workflow: Multi-step workflow with dependencies
- patrol: Repeating patrol cycle for wisps
Replaces the simple formulas.go that only delegated to `bd formula list`.
The `formulas` alias is preserved for backwards compatibility.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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