Add agent discovery setup to the CLI

[zx000097]

Summary

• add CLI setup and remove commands for agent discovery and configuration
• support GitHub Copilot, Claude, and Codex with managed instruction updates
• package the Microsoft Learn CLI skill assets and document the new workflows
• add unit coverage and repository validation for the setup surface

[Copilot]

🟡 Changes recommended

The managed-markdown end-marker search logic can select the wrong marker and corrupt or mis-edit instruction files, and the CLI development docs include Windows-only commands.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR adds a “CLI-first” agent discovery workflow to the Microsoft Learn CLI so users can install/remove a bundled skill plus always-loaded instructions for GitHub Copilot, Claude Code, and Codex, without configuring MCP.

Changes:

• Introduces mslearn setup / mslearn remove commands that write/remove managed discovery assets in user or project scope (including Codex managed-section edits to AGENTS.md / AGENTS.override.md).
• Bundles discovery assets into the npm package (cli/assets/microsoft-learn-cli/*) and updates documentation to describe CLI-first vs plugin (MCP-first) modes.
• Expands unit coverage around installation/removal idempotency and updates repo validation to include the new CLI files/assets.

File summaries

File	Description
scripts/validate-repo.ps1	Adds new CLI command/setup modules and packaged assets to the repo validator allowlist.
README.md	Documents the new CLI-first setup/remove workflow and clarifies CLI-first vs MCP-first modes.
cli/test/unit/cli.test.ts	Adds filesystem-backed tests covering setup/remove behavior, idempotency, and Codex managed-section handling.
cli/src/setup/managed-markdown.ts	Implements managed-section upsert/removal helpers for Codex instruction files.
cli/src/setup/copilot.ts	Defines Copilot discovery file locations for global/project scope.
cli/src/setup/agents.ts	Centralizes per-agent discovery paths/assets and instruction formatting (e.g., Copilot frontmatter).
cli/src/index.ts	Registers new setup and remove commands in the CLI program.
cli/src/context.ts	Extends CLI context to include cwd and homeDir for path resolution.
cli/src/commands/setup.ts	Implements mslearn setup to install skills/instructions across selected agents/scopes.
cli/src/commands/remove.ts	Implements mslearn remove to remove only managed discovery content and preserve unrelated files.
cli/README.md	Adds “Agent discovery” docs and updates command reference and development instructions.
cli/package.json	Ensures assets/ ships in the npm package and makes build remove dist/ before compiling.
cli/assets/microsoft-learn-cli/SKILL.md	Adds the bundled CLI-first skill content installed into agent skill directories.
cli/assets/microsoft-learn-cli/INSTRUCTIONS.md	Adds the bundled always-loaded instruction content referenced by setup.

Review details

• Files reviewed: 14/14 changed files
• Comments generated: 2
• Review effort level: Lite

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[zx000097]

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[Eric Imasogie (Eimasogi)]

LGTM