good first issue: add CLI tool kit template

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Scope

Add a cli kit template to packages/dotdog/kits/cli/.

Files needed

• SPEC.dog — CLI tool spec: commands, flags, config, output
• constitution.dog — constraints: stdin/stdout, exit codes, --help required
• data-model.dog — entities: Command, Flag, Config, Output

Pattern

Copy packages/dotdog/kits/dao/ as a template. Same 3-file structure.

Verify

bun test

Kit should appear in dotdog kit init list.