Feature: Import/Export Squad configuration directly to/from a repository #1128

Summary

Users should be able to import and export their Squad configuration (team.md, decisions.md, routing.md, skills, etc.) directly to/from a GitHub repository, rather than only local file system operations.

Motivation

• Enables sharing Squad configurations across teams and machines via a central repo
• Supports version-controlled Squad configs as a source of truth
• Simplifies onboarding — new team members can import a Squad setup from a shared repo in one step

Proposed Behavior

• Export to repo: Push the current Squad configuration to a specified GitHub repository (or branch)
• Import from repo: Pull a Squad configuration from a repository URL and apply it locally

Related Issues

• Squad Export/Import: blank decisions.md, blank team.md. #1122 (Export/Import produces blank files)
• Petition to add routing.md to squad export / import functionality #1123 (Add routing.md to export/import)