feat: accept pool name as positional arg in browser-pools create (#110)

## Summary

Allow `kernel browser-pools create my-pool` as shorthand for `kernel
browser-pools create --name my-pool`. The `--name` flag still works for
backward compatibility. added this because I forget to add `--name`

## Testing
Previously we created the pool and ignored the passed name
```
❯ kernel browser-pools create test --size 1
 SUCCESS  Created browser pool a8e4g5n4doawmwwy7dip8qqz
```
Now we are creating the pool and the name is set. `--name` still works
```
❯ ./bin/kernel browser-pools create test --size 1
 SUCCESS  Created browser pool test (pctp2h92siimy4jxks89g33g)
❯ ./bin/kernel browser-pools create --name test --size 1
  ERROR   Conflict: A pool with this name already exists
```

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Small CLI parsing change limited to `browser-pools create`; low blast
radius aside from potential behavior change when both `--name` and a
positional name are supplied.
> 
> **Overview**
> `kernel browser-pools create` now accepts an optional positional
`[name]` argument as a shorthand for `--name`.
> 
> The command enforces mutual exclusivity between the positional name
and `--name` (returns an error if both are provided) and updates the
Cobra command usage/arg validation accordingly.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
46881b1. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: tnsardesai

cmd/browser_pools.go

@@ -404,8 +404,9 @@ var browserPoolsListCmd = &cobra.Command{
 }
 
 var browserPoolsCreateCmd = &cobra.Command{
-	Use:   "create",
+	Use:   "create [name]",
 	Short: "Create a new browser pool",
+	Args:  cobra.MaximumNArgs(1),
 	RunE:  runBrowserPoolsCreate,
 }
 
@@ -518,6 +519,12 @@ func runBrowserPoolsCreate(cmd *cobra.Command, args []string) error {
 	client := getKernelClient(cmd)
 
 	name, _ := cmd.Flags().GetString("name")
+	if len(args) > 0 && args[0] != "" {
+		if cmd.Flags().Changed("name") {
+			return fmt.Errorf("cannot specify pool name as both a positional argument and --name flag")
+		}
+		name = args[0]
+	}
 	size, _ := cmd.Flags().GetInt64("size")
 	fillRate, _ := cmd.Flags().GetInt64("fill-rate")
 	timeout, _ := cmd.Flags().GetInt64("timeout")