[bot] Update Learning Hub for March 2026 Copilot CLI releases (v1.0.4–v1.0.7)

[github-actions]

What changed

Reviewed GitHub Copilot CLI releases from the past 7 days (v1.0.4 on March 11 through v1.0.7 on March 17, 2026) and updated the Learning Hub to reflect new features and improvements.

New features/changes found

From v1.0.7 (March 17):

• New subagentStart hook event — fires when a subagent is spawned, with support for injecting additional context into the subagent's prompt

From v1.0.6 (March 16):

• Cross-client hook compatibility — hook config files now work across VS Code, Claude Code, and the CLI without modification (PascalCase event names accepted; Claude Code's nested matcher/hooks structure supported)
• Open Plugin Spec support — plugins using .claude-plugin/plugin.json discovered via --plugin-dir; .lsp.json / .github/lsp.json locations supported; PascalCase hook events, : namespace separator, and exclusive path mode

From v1.0.5 (March 13):

• Open Plugin Spec path lsp.json / .github/lsp.json support (captured in plugins update)

From v1.0.4 (March 11):

• Various bug fixes and stability improvements (no documentation changes needed)

Sections updated

automating-with-hooks.md

• Added subagentStart to the Hook Events table (between agentStop and subagentStop)
• Added new Cross-Client Compatibility section documenting PascalCase event name support and Claude Code nested matcher/hooks structure
• Added new Injecting Context into Subagents with subagentStart practical example
• Updated lastUpdated to 2026-03-18

installing-and-using-plugins.md

• Added new Open Plugin Spec Compatibility section documenting .claude-plugin/plugin.json, .lsp.json, PascalCase hooks, : namespace separator, and exclusive path mode
• Updated lastUpdated to 2026-03-18

Note: Both files in website/src/content/learning-hub/ are symlinked from website/src/content/docs/learning-hub/, so the docs mirror is automatically kept in sync.

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