[bot] Update Learning Hub for /plugins removal, MCP 2026-07-28, hook trace context, and copilot app command

[github-actions]

What changed

Based on the GitHub Copilot CLI changelog (v1.0.81, 2026-08-27) and recent releases, this PR updates the Learning Hub to reflect several breaking/notable changes:

1. /plugins command removed — installing-and-using-plugins.md now documents that /plugins was removed in v1.0.81 in favor of /plugin, /mcp, /skills, /subagents, and /instructions. Notes the plugins dashboard is now on by default (PLUGINS_DASHBOARD=false to opt out), the new /plugin update-available indicator, and that hook/LSP enable-disable toggles are temporarily unavailable after the dashboard consolidation.
2. MCP 2026-07-28 spec support — understanding-mcp-servers.md notes that CLI, SDK, IDE, and in-memory clients now support the newer MCP protocol revision.
3. Hook OpenTelemetry trace context — automating-with-hooks.md documents the new traceparent/tracestate fields available to hook inputs (and as env vars for command hooks) for correlating hook telemetry with session traces.
4. copilot app CLI command — github-copilot-app.md documents the new copilot app command to open the GitHub Copilot desktop app in the current directory.

All four pages had their lastUpdated frontmatter bumped to 2026-08-28.

Sources

• https://raw.githubusercontent.com/github/copilot-cli/main/changelog.md (v1.0.81, v1.0.79-1.0.80 entries)
• GitHub API releases for github/copilot-cli

Note: github.blog, code.visualstudio.com, and the community copilot-guide site were not reachable from this sandbox environment (network policy blocked them), so this update is based on the copilot-cli changelog and release data only. The cli-for-beginners section was intentionally left untouched per instructions.

Warning

Firewall blocked 3 domains

The following domains were blocked by the firewall during workflow execution:

• code.visualstudio.com
• github.blog
• nishanil.github.io

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "code.visualstudio.com"
    - "github.blog"
    - "nishanil.github.io"

See Network Configuration for more information.

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