Simplified GitHub Actions Example

What: The example claude_args in the workflow template is now clearer and more focused.

Before:

# claude_args: '--model claude-opus-4-1-20250805 --allowed-tools Bash(gh pr:*)'

After:

# claude_args: '--allowed-tools Bash(gh pr:*)'

Why: Removing the model specification makes the example less cluttered and focuses on the most common customization (tool permissions).

Evidence: Line 398163 in v2.0.8 shows simplified example (compare to line 407708 in v2.0.5)