docs: clarify Claude quick-start auth + initialization path

[Copilot]

Quick Start was Copilot-first and omitted two Claude-critical onboarding details: CLAUDE_CODE_OAUTH_TOKEN is unsupported, and gh aw init defaults to Copilot-oriented artifacts unless an engine is specified. This update makes those constraints explicit in the primary setup path.

• Quick Start command flow (Claude path)

  • Adds gh aw init --engine claude to the setup commands.
  • Clarifies when to run it (new Claude setup) vs skip it (already initialized or non-Claude setup).
  • States explicitly that bare gh aw init produces Copilot-oriented init artifacts.

• Claude auth caveat surfaced inline

  • In the ANTHROPIC_API_KEY note, adds that CLAUDE_CODE_OAUTH_TOKEN (Claude Max/Teams OAuth) is ignored and unsupported.
  • Directs users to use ANTHROPIC_API_KEY instead.

# Claude users: initialize repo artifacts for Claude
gh aw init --engine claude

# Then add a workflow
gh aw add-wizard githubnext/agentics/daily-repo-status

[Copilot]

Pull request overview

Updates the Quick Start documentation to make Claude-specific onboarding requirements explicit, especially around repository initialization and supported authentication methods.

Changes:

• Adds gh aw init --engine claude to the primary Quick Start command flow, with guidance on when to run vs skip it.
• Clarifies that running gh aw init without an engine produces Copilot-oriented initialization artifacts.
• Adds an inline warning that CLAUDE_CODE_OAUTH_TOKEN is unsupported/ignored, and that Claude requires ANTHROPIC_API_KEY.

Show a summary per file

File	Description
docs/src/content/docs/setup/quick-start.mdx	Clarifies Claude initialization and authentication caveats in the Quick Start path.

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[github-actions]

@copilot please summarize any remaining blockers and confirm whether this PR is ready to merge.

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