Remove GitHub API call from CLI initialization hot path

[Copilot]

The trial command was calling getCurrentGitHubUsername() during initialization to populate the --host-repo flag's default value description. This GitHub API call executed on every CLI invocation, adding unnecessary latency to all commands.

Changes

Removed hot path API call

• Deleted getCurrentGitHubUsername() invocation from NewTrialCommand() initialization
• Updated --host-repo flag description to use static placeholder <username>/gh-aw-trial

Preserved lazy resolution

• Username resolution remains in RunWorkflowTrials() when no --host-repo is provided
• Behavior unchanged; API call now only happens when actually needed

- // Get current username for default trial repo description
- username, _ := getCurrentGitHubUsername()
- defaultHostRepo := "gh-aw-trial"
- if username != "" {
-     defaultHostRepo = fmt.Sprintf("%s/gh-aw-trial", username)
- }
- cmd.Flags().String("host-repo", "", fmt.Sprintf("Custom host repository slug (defaults to '%s'). Use '.' for current repository", defaultHostRepo))
+ cmd.Flags().String("host-repo", "", "Custom host repository slug (defaults to '<username>/gh-aw-trial'). Use '.' for current repository")

Command initialization now executes in ~11ms instead of potentially several seconds depending on network latency.

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[Copilot]

Pull request overview

This PR removes a GitHub API call from the CLI initialization hot path to improve performance. Previously, every invocation of the CLI triggered an API call to fetch the current username, even for commands that didn't need it.

Changes:

• Removed getCurrentGitHubUsername() call from NewTrialCommand() initialization
• Updated --host-repo flag description to use static placeholder text <username>/gh-aw-trial
• Preserved lazy username resolution in RunWorkflowTrials() when the flag value is needed

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