feat: add init workflow and command surface listing

Summary

• Add a vendored fabrik init workflow with declarative templates for Rust, Elixir, Go, macOS CLI, and iOS apps
• Add agent-friendly init and command-surface discovery output, including global and subtree --list support in JSON and toon formats
• Rename init templates to intent-based ids, keep legacy aliases, and add human-focused template selection with color-aware terminal output
• Add shellspec coverage for init flows and CLI surface discovery, plus CLI and README updates

Testing

• mise exec – cargo test -p fabrik-cli
• mise exec – cargo build –release
• mise exec – shellspec spec/cli_surface_spec.sh spec/init_spec.sh

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