chore: remove mdltool

[doringeman]

Thanks to #567 and #568. Tested in https://github.com/docker/model-publisher/pull/77.

[gemini-code-assist]

Summary of Changes

Hello @doringeman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly streamlines the project by eliminating the standalone model-distribution-tool CLI. This change consolidates the pkg/distribution module's purpose to strictly serve as a Go library for model distribution, simplifying the codebase, reducing maintenance burden, and clarifying its intended use. The removal encompasses all associated build configurations, source files, tests, and documentation.

Highlights

• Removal of mdltool CLI: The model-distribution-tool command-line interface, along with its entire source code (cmd/mdltool/main.go), tests (cmd/mdltool/main_test.go), and dedicated Makefile (pkg/distribution/Makefile), has been completely removed from the project.
• Makefile Cleanup: All references, build targets, variables, and help messages related to the model-distribution-tool (e.g., mdl-pull, mdl-package) have been purged from the main Makefile.
• Documentation Update: The pkg/distribution/README.md has been updated to reflect that model-distribution is now solely a Go library, removing all mentions and examples of the mdltool CLI and adjusting library usage examples.
• Git Ignore Update: The .gitignore file has been cleaned up to remove entries for model-distribution-tool and model-store/, which were associated with the removed CLI.

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `pkg/distribution/README.md:7` </location>
<code_context>
 ## Overview

-Model Distribution is a Go library and CLI tool that allows you to package, push, pull, and manage models using container registries. It provides a simple API and command-line interface for working with models in GGUF and Safetensors format.
+Model Distribution is a Go library that allows you to package, push, pull, and manage models using container registries. It provides a simple API for working with models in GGUF and Safetensors format.

 ## Features
</code_context>

<issue_to_address>
**nitpick (typo):** Consider using plural "formats" when referring to GGUF and Safetensors.

Because you reference both GGUF and Safetensors, using the plural "formats" instead of "format" reads more naturally.

```suggestion
Model Distribution is a Go library that allows you to package, push, pull, and manage models using container registries. It provides a simple API for working with models in GGUF and Safetensors formats.
```
</issue_to_address>

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[gemini-code-assist]

Code Review

This pull request successfully removes the mdltool and all its associated files, including the Go source code, test files, and Makefile entries. The .gitignore and pkg/distribution/README.md files have been updated to reflect the removal of the CLI tool and to correctly reference the library's API changes. The changes are clean and consistent with the stated objective of removing the tool.

[ilopezluna]

Thank you @doringeman!! 👏 👏