Add L400 GitHub Enterprise Administration & Governance documentation

[Copilot]

Implements comprehensive expert-level documentation for GitHub Enterprise Cloud administration and governance based on the approved plan in final-prompt-plan.md.

Documentation Created (10 files, 487KB, 14,537 lines)

Enterprise & Organization

• 01-enterprise-hierarchy.md - Enterprise structure, roles, multi-org management, audit logging
• 02-organization-strategies.md - Single/multi-org patterns (red-green-sandbox-archive), decision matrices, migration strategies

Identity & Access Management

• 03-identity-access-management.md - SAML SSO, SCIM provisioning, enterprise type selection, PAT policies
• 04-enterprise-managed-users.md - EMU architecture, advantages, limitations, IdP configuration, migration runbooks

Governance & Security

• 05-teams-permissions.md - Team hierarchy, permission models, CODEOWNERS, IdP synchronization
• 06-policy-inheritance.md - Enterprise → Org → Repo policy enforcement, Actions/Copilot/Pages policies
• 07-repository-governance.md - Rulesets vs branch protection, tag protection, merge strategies, innersource
• 08-security-compliance.md - GHAS (CodeQL, secret scanning, Dependabot), SIEM integration, SOC2/FedRAMP/ISO certifications

Best Practices & Reference

• 09-best-practices-waf.md - GitHub Well-Architected Framework (5 pillars: Reliability, Security, Operational Excellence, Performance, Cost), enterprise setup, CI/CD governance, anti-patterns
• 10-reference-architecture.md - Consolidated architecture diagrams, organization topologies, IAM flows, quick reference cards (permissions, CLI, Terraform)

Technical Content

Each document includes:

• 30+ Mermaid diagrams - Architecture flows, sequence diagrams, decision trees, state machines
• 100+ code examples - YAML workflows, Terraform configs, CLI commands, API calls
• Cross-references - Relative links between related topics
• References sections - Official GitHub documentation, industry standards

Example architecture from 10-reference-architecture.md:

graph TB
    subgraph "GitHub Enterprise Cloud"
        Enterprise[Enterprise Account]
        subgraph "Organizations"
            OrgProd[Production Org]
            OrgDev[Development Org]
        end
        subgraph "Security Layer"
            GHAS[GitHub Advanced Security]
            CodeQL[Code Scanning]
        end
    end
    subgraph "Identity Provider"
        IdP[Entra ID / Okta]
        SCIM[SCIM Provisioning]
    end
    
    IdP -->|SAML Auth| Enterprise
    SCIM -->|Provision Users| OrgProd
    GHAS --> CodeQL

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README Update

Added L400 workshop section at top with categorized links to all documentation:

• Enterprise Administration (hierarchy, org strategies)
• Identity & Access Management (IAM, EMU)
• Teams & Permissions (teams, policy inheritance)
• Repository Governance (governance, security)
• Best Practices & Architecture (WAF, reference architectures)

Preserved existing hands-on labs section below workshop documentation.

Original prompt

Start implementation

[Chronological Review: The conversation began with the user requesting assistance in refining a plan and creating a final-prompt-plan.md file for agentic implementation. The user then specified various topics to include in the documentation, such as enterprise hierarchy, IAM flow, and best practices for GitHub administration. Subsequent requests involved updating the plan to include a section on GitHub EMU, ensuring the workshop title and description were at the beginning of the README, and reevaluating the entire plan for comprehensive technical documentation. The user finally requested to start the implementation.]

[Intent Mapping:

1. "Help me refine the plan and create a final-prompt-plan.md file with the final plan once you improved and make it ready for an agentic implementation."
2. "docs folder, Enterprise hierarchy, IAM flow, policy inheritance, organisations strategies, single vs red-green-sandbox-archive, yes cross-link but dont focus on labs, mainly focus on L400 advanced workshop for github administration and governance."
3. "update the plan to include a section dedicated to GitHub EMU and all the enhancements and advantages, best practices for EMU."
4. "It should be at the beginning of the readme the section not at the end. and it should have the workshop title with a short description."
5. "you your judgement, staty curious, act with care and only change if required. REEVALUATE the entire plan and ensure it will create a comprehensive deep-dive technical documentation for GitHub Administration and Governance. ONLY change if needed."
6. "Start implementation."]

[Technical Inventory:

• GitHub EMU (Enterprise Managed Users): Enhancements and best practices.
• Documentation structure: README and final-prompt-plan.md files.
• Topics for documentation: Enterprise hierarchy, IAM flow, policy inheritance, organizational strategies, and GitHub administration best practices.]

[Code Archaeology:

• File: final-prompt-plan.md
• Purpose: To serve as a comprehensive plan for GitHub administration and governance documentation.
• Recent changes: User requested specific content updates and structural changes to the README and final-prompt-plan.md files.]

[Progress Assessment:

• Completed Tasks: User has outlined key topics for documentation and requested structural changes.
• Partially Complete Work: The plan is still under refinement, and implementation has just been initiated.]

[Context Validation: All critical information for continuation is captured, including user requests for specific content and structural changes.]

[Recent Commands Analysis:

• Last Agent Commands: User requested to "Start implementation."
• Tool Results Summary: No specific tool results were returned as the conversation focused on planning and structuring documentation.
• Pre-Summary State: The agent was preparing to implement the refined plan based on user requests.
• Operation Context: The commands executed were aimed at finalizing the documentation plan and beginning the implementation phase.]

1. Conversation Overview: - Primary Objectives: - "Help me refine the plan and create a final-prompt-plan.md file with the final plan once you improved and make it ready for an agentic implementation." - "update the plan to include a section dedicated to GitHub EMU and all the enhancements and advantages, best practices for EMU." - "It should be at the beginning of the readme the section not at the end. and it should have the workshop title with a short description." - Session Context: The conversation flowed from planning and structuring documentation to initiating implementation based on user-defined requirements. - User Intent Evolution: The user shifted from requesting a refined plan to specifying content and structure, culminating in a request to start implementation.

2. Technical Foundation:

• GitHub EMU: Focus on enhancements and best practices for Enterprise Managed Users.
• Documentation Structure: Emphasis on README and final-prompt-plan.md files.
• Topics for Documentation: Enterprise hierarchy, IAM flow, policy inheritance, organizational strategies, and GitHub administration best practices.

3. Codebase Status:

• File Name: final-prompt-plan.md
• Purpose: To serve as a comprehensive plan for GitHub administration and governance documentation.
• Current State: User requested specific content updates and structural changes.
• Key Code Segments: Not specified in recent exchanges.
• Dependencies: Related to overall documentation structure and content.

4. Problem Resolution:

• Issues Encountered: None explicitly stated; focus was on planning and structuring.
• Solutions Implemented: User-defined changes to documentation structure and content.
• Debugging Context: No ongoing troubleshooting efforts mentioned.
• Lessons Learned: Importance of clear structure and comprehensive content in technical documentation.

5. Progress Tracking:

• Completed Tasks: User ha...

Created from VS Code.

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[Copilot]

Pull request overview

This PR implements comprehensive expert-level (L400) documentation for GitHub Enterprise Cloud administration and governance. The documentation was created based on an approved plan and provides deep technical content including enterprise hierarchy, organization strategies, identity management (with dedicated EMU coverage), policy inheritance, repository governance, security/compliance, best practices aligned with the GitHub Well-Architected Framework, and reference architectures.

Changes:

• Added 10 comprehensive documentation files covering all aspects of GitHub Enterprise administration and governance
• Updated README.md to feature the L400 workshop documentation prominently with categorized navigation
• Included 30+ Mermaid diagrams for visual architecture representation and 100+ practical code examples

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/initial-prompt.md	Planning document outlining documentation objectives and source materials
docs/final-prompt-plan.md	Detailed implementation plan with file specifications and structure
docs/01-enterprise-hierarchy.md	Enterprise account structure, roles, multi-org management patterns
docs/07-repository-governance.md	Repository settings, rulesets vs branch protection, lifecycle management
docs/08-security-compliance.md	GitHub Advanced Security features, compliance certifications, audit logging
docs/09-best-practices-waf.md	GitHub Well-Architected Framework with 5 pillars and enterprise patterns
docs/10-reference-architecture.md	Consolidated architecture diagrams, quick reference cards, integration patterns
README.md	Updated with L400 workshop section and categorized documentation links

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