[bot] Document GPT-6 Astra, vim mode, and Copilot app v1.1.15 features

[github-actions]

Summary

Checked recent GitHub Copilot updates (CLI changelog, GitHub Copilot app changelog, latest releases) and compared against the Learning Hub pages (excluding cli-for-beginners, which is handled separately). Found several undocumented features from the last ~7 days and added them to the appropriate existing pages — no new page was warranted since these are incremental additions to already-covered topics.

New features/changes found and documented

• GitHub Copilot CLI v1.0.83–v1.0.84
  • GPT-6 Astra model support
  • Vim mode (/vim, editorMode: vim) now available to everyone in the prompt composer
  • taskbarPresence setting to opt out of the Windows 11 taskbar session status feature
• GitHub Copilot app v1.1.15
  • /goal command — set a persistent objective for autopilot in local sessions
  • Attach images/videos directly to pull request descriptions
  • Install MCP servers via a deep link with a prefilled review/confirmation form
  • Expanded stacked pull request support (stack numbers, direct links, jump-to-session from the merge box)

Sections updated

• website/src/content/docs/learning-hub/copilot-configuration-basics.md — Model Picker section (GPT-6 Astra) and CLI Session Commands section (vim mode, taskbar opt-out)
• website/src/content/docs/learning-hub/github-copilot-app.md — Agent Merge section (stacked PR updates) plus new "Autopilot Goals", "Attaching Images and Videos to Pull Requests", and "Installing MCP Servers via Deep Link" subsections
• website/src/content/docs/learning-hub/understanding-mcp-servers.md — cross-linked the new MCP deep-link install flow under "Installing MCP Servers from the Registry"

All three pages had their lastUpdated frontmatter bumped to reflect the changes.

Source announcements

• https://raw.githubusercontent.com/github/copilot-cli/main/changelog.md (v1.0.83 – v1.0.84-3, releases dated 2026-09-04 to 2026-09-09)
• github/app repository changelog.md (v1.1.14 – v1.1.16, releases dated 2026-08-26 to 2026-09-08)

Note: github.blog and code.visualstudio.com were not reachable from this sandboxed environment (network policy blocks those domains), so this update relies on the CLI and app repository changelogs plus GitHub release notes, which were accessible.

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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