fix(cli): correct bench command usage to show MODEL as required

[doringeman]

Correct bench command usage to show MODEL as required

[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 resolves an inconsistency in the CLI's bench command, ensuring that both its internal definition and external documentation accurately convey that the MODEL argument is required. This change enhances user clarity and improves the overall accuracy of the command-line interface.

Highlights

• CLI Command Definition: The bench command's definition in cmd/cli/commands/bench.go has been updated to explicitly mark MODEL as a required argument by removing the surrounding square brackets from its Use field.
• Documentation Alignment: The usage documentation for the docker model bench command in cmd/cli/docs/reference/docker_model_bench.yaml has been synchronized to reflect that MODEL is a mandatory argument, matching the updated command definition.

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `cmd/cli/commands/bench.go:60` </location>
<code_context>

 	cmd := &cobra.Command{
-		Use:   "bench [MODEL]",
+		Use:   "bench MODEL",
 		Short: "Benchmark a model's performance at different concurrency levels",
 		Long: `Benchmark a model's performance showing tokens per second at different concurrency levels.
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Align cobra Args validation with the now-required MODEL argument.

Since the `Use` string now treats `MODEL` as required, the command should enforce this via `Args` (e.g., `Args: cobra.ExactArgs(1)`) so it doesn’t accept runs without a model despite the help text indicating otherwise.
</issue_to_address>

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[gemini-code-assist]

Code Review

This pull request correctly updates the usage string for the bench command in both the command implementation and its documentation. By changing [MODEL] to MODEL, it accurately reflects that the model argument is required, which aligns with the cobra.ExactArgs(1) validation. The changes are straightforward, correct, and improve the command's usability by providing clear and accurate usage instructions to the user.