docs-11: Create Team And Enterprise Documentation Tier

[djm81]

Summary

Create team and enterprise documentation tier with 4 guides: team collaboration, agile/scrum setup, multi-repo setups, enterprise configuration.

OpenSpec Change

• Change folder: openspec/changes/docs-11-team-enterprise-tier/
• Priority: P2
• Depends on: docs-06-modules-site-ia-restructure

Source Plan

specfact-cli-internal/docs/internal/implementation/2026-03-23-docs-refactoring-beginner-to-enterprise-plan.md