feat: add primer cli exploration

[joshblack]

Exploration into a primer cli as an alternative to MCP server. Will be trying this out over in primer/agent-eval 👀

[changeset-bot]

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[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[joshblack]

@copilot add support for icons from octicons/octicons-react to primer cli

[Copilot]

@copilot add support for icons from octicons/octicons-react to primer cli

Implemented in 5cca355.

Primer CLI now supports icons from @primer/octicons-react with:

• primer icons list
• primer icons get <name> (supports icon name or React export name)

I also updated packages/cli/README.md examples to include icon usage.