Fix Windows CLI file URL path handling

[Peter7896]

Closes #24

Summary

• Converts the ESM module URL with fileURLToPath before passing the base directory to bagofcli.
• Prevents Windows file URLs from being treated as path strings such as /C:/..., which can become duplicated drive-letter paths when bagofcli reads conf/commands.json.
• Adds a CLI regression test that asserts bagofcli receives the native filesystem directory.

Validation

• npm ci --ignore-scripts --no-audit --no-fund
• npx mocha test\cli.js
• npx mocha test/**/*.js
• node bin\rtk.js --help
• npx eslint lib\cli.js test\cli.js
• git diff --check