[bot] docs: document Copilot CLI v1.0.84 command changes, Vim mode GA, and GPT-6 Astra

[github-actions]

What's new in GitHub Copilot CLI (past 7 days)

Reviewed the github/copilot-cli changelog and GitHub Releases (v1.0.83 → v1.0.84-4, Sept 4–10, 2026):

1. CLI command restructuring (v1.0.84+) — The cross-kind copilot plugins subcommand family was split into dedicated per-kind commands:
   • copilot instruction list / copilot lsp list replace copilot plugins list --kind instruction / --kind lsp
   • copilot skill add [--project] replaces copilot plugins install --skill [--scope project]
   • enable/disable now live directly on copilot plugin, copilot mcp, and copilot skill, replacing the cross-kind copilot plugins enable/disable --plugin|--mcp|--skill
   • The cross-kind --kind, --scope, --mcp, --skill flags were removed from copilot plugins; copilot plugins list is now a plain alias for copilot plugin list (plugins only, and --json now returns a flat array instead of { plugins, errors })
   • --json was added to copilot plugin list, copilot plugin marketplace list, and copilot plugin marketplace browse
2. Vim mode is now available to everyone (v1.0.84+) — Turn it on with /vim or editorMode: vim.
3. New model: GPT-6 Astra (v1.0.84+) — Added to the CLI's model roster.

Note: github.blog, code.visualstudio.com, and nishanil.github.io were unreachable from this sandbox (network egress blocked at the proxy), so this update is based on the copilot-cli GitHub changelog/releases only, which was reachable via raw.githubusercontent.com and the GitHub API. No new entries were found in the VS Code Insiders 1.138 notes or the nishanil/copilot-guide repo's recent commit history relevant to this scope.

Sections updated

• website/src/content/docs/learning-hub/installing-and-using-plugins.md — documented the v1.0.84 copilot plugins → per-kind command split.
• website/src/content/docs/learning-hub/creating-effective-skills.md — added copilot skill enable/disable and noted the --scope → --project rename.
• website/src/content/docs/learning-hub/copilot-configuration-basics.md — added Vim mode GA and GPT-6 Astra to the model aliases note.
• website/src/content/docs/learning-hub/building-custom-agents.md — added GPT-6 Astra to the model choice table.

(The cli-for-beginners section was intentionally left untouched per the maintenance instructions.)

Source

• https://raw.githubusercontent.com/github/copilot-cli/main/changelog.md
• https://api.github.com/repos/github/copilot-cli/releases/tags/v1.0.84-0 (and -1, -2, -3, -4)

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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