[bot] Add Critic agent and built-in skills documentation (v1.0.17–v1.0.18)

[DanWahlin]

What's New in v1.0.17–v1.0.18

New features found

v1.0.18 (April 4, 2026)

• Critic agent — A new built-in agent that automatically reviews plans and complex implementations using a complementary model to catch errors early. Available in experimental mode for Claude models.
• preToolUse hook permissionDecision 'allow' — suppresses the tool approval prompt (advanced, not documented here)
• Notification hook event — fires asynchronously on shell/agent completion (advanced)

v1.0.17 (April 3, 2026)

• Built-in skills — Skills are now bundled with the CLI itself, starting with a guide for customizing the Copilot cloud agent environment. Previously, the course only covered project-level and personal skills.

Also verified already covered:

• /share html — already documented in Chapter 02 ✅
• /mcp auth — already documented in Chapter 06 ✅

Sections updated

Chapter 04 — Agents and Custom Instructions

• Added the Critic agent to the built-in agents table, noting it's automatic/experimental and available for Claude models.

Chapter 05 — Skills System

• Added a third row to the skill locations table: built-in CLI skills, explaining they ship bundled with the CLI.

Source announcements

• v1.0.18 release
• v1.0.17 release

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