Added AuthHelpers AI launch pipeline

Property	Value
description	Added the grouped auth surface for readiness checks, GitHub MCP token loading, and provider-based AI launch.
version	1.0.0
type	Create
related	AuthHelpers, AI Readiness, GitHub MCP Token, Start AI

• Added mac-cli auth check-ai as the read-only readiness diagnostic surface.
• Added mac-cli auth load-github-mcp-token as the 1Password-backed session token loader.
• Added mac-cli auth start-ai as the provider-based launch surface.
• Added provider/profile config resolution with the current default Codex/default profile model.
• Added ordered pre-launch hook support with per-hook parameter maps and ContinueOnHookError profile control.