🔧 Refactor CLI init command flags and options

[dsyme]

Summary

• Simplified gh aw init command by removing explicit --engine copilot flag
• Updated documentation to reflect simplified initialization process
• Reorganized and hidden deprecated command flags for cleaner CLI experience

Changes

The pull request modifies the initialization command for the GitHub Agentic Workflows CLI, focusing on simplifying the user experience and cleaning up the command-line interface.

[Copilot]

Pull request overview

Simplifies the gh aw init CLI experience by de-emphasizing engine selection flags and cleaning up deprecated options, and updates setup docs to reflect the streamlined initialization flow.

Changes:

• Adds (and hides) an --engine/-e flag on init and reorganizes/hides the deprecated --mcp flag.
• Updates install.md and CLI setup docs to show gh aw init without explicitly passing --engine copilot.
• Moves deprecated flags out of the primary help surface for a cleaner CLI.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
pkg/cli/init_command.go	Refactors init flags: introduces hidden --engine and repositions/hides deprecated --mcp.
install.md	Updates the installation/setup instructions to run gh aw init without --engine copilot.
docs/src/content/docs/setup/cli.md	Removes --engine init examples to align docs with the simplified init UX.

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