[bot] Update Learning Hub with Copilot CLI v1.0.15–v1.0.18 features

[github-actions]

What's New

Reviewed the GitHub Copilot CLI changelog for the past 7 days (v1.0.13–v1.0.18, released March 30–April 4, 2026) and updated three Learning Hub pages with newly shipped features.

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New Features Found

Version	Date	Feature
v1.0.18	2026-04-04	Critic agent (experimental, Claude models) — reviews plans/implementations with a complementary model
v1.0.18	2026-04-04	notification hook event — fires asynchronously on shell completion, permission prompts, elicitation dialogs, agent completion
v1.0.18	2026-04-04	preToolUse permissionDecision: 'allow' return value — silently suppresses the tool approval prompt
v1.0.17	2026-04-03	Built-in skills bundled with CLI — first skill is a guide for customizing Copilot cloud agent environment
v1.0.16	2026-04-02	PermissionRequest hook event — programmatically approve/deny tool permission requests

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Sections Updated

automating-with-hooks.md

• Added PermissionRequest and notification to the hook events reference table
• Updated the preToolUse callout to document the permissionDecision: 'allow' return value
• Added "Programmatic Permission Approval with PermissionRequest" example section
• Added "Async Notifications with the notification Event" example section

creating-effective-skills.md

• Added "Built-in Skills" subsection explaining CLI-bundled skills (v1.0.17) and how they coexist with custom skills

using-copilot-coding-agent.md

• Added Critic agent bullet point to "Setting Up for Success" best practices

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Source Announcements

• GitHub Copilot CLI changelog v1.0.18 — Critic agent, notification hook, permissionDecision 'allow'
• GitHub Copilot CLI changelog v1.0.17 — Built-in CLI skills
• GitHub Copilot CLI changelog v1.0.16 — PermissionRequest hook

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