[Feat]: Add CLI tool for skill discovery and listing

[rosspeili]

Feature Description

It is tedious to manually browse directories and manifest.yaml files to see what capabilities are installed locally. We need a dedicated skillware CLI command to quickly discover and list available skills.

The command should be executable via the terminal (e.g., skillware list) and output a clean, readable overview of the local registry.

Rationale

As the skill library grows and users begin installing third-party skills, developers need a fast, programmatic way to see exactly what "know-how" is available to their agents without digging through Python virtual environments or raw folders.

Implementation Idea

1. Add a CLI entry point in pyproject.toml pointing to a new skillware/cli.py module.
2. Implement a simple command using the built-in argparse library (or an external library like typer).
3. Have the command iterate through the skills/ directory (or use the output from the newly proposed Registry Mapping system) and print a formatted table detailing registered skill IDs, categories, descriptions, and required Python dependencies.
4. Using the rich library to render the terminal table is highly encouraged!