New `gh discussion` command set; manage issue types, sub-issues, and relationships

Issue types, sub-issues, and relationships in gh issue

<img width="2784" height="1494" alt="issue-view-monas-cafe-with-frame" src="https://github.com/user-attachments/assets/fd2c6a89-0ac2-472d-a1df-b4e6124f270b" />

This release brings GitHub's advanced issue features to gh issue create, edit, view, and list. You can set and view an issue's type, organize work with sub-issues, and track blocked-by and blocking relationships without leaving the command line:

# Set an issue's type
gh issue create --type Bug
gh issue edit 123 --type Bug

# Organize work with sub-issues
gh issue create --parent 100
gh issue edit 100 --add-sub-issue 123

# Track blocked-by and blocking relationships
gh issue create --blocked-by 200
gh issue edit 123 --add-blocking 300

Issue types and sub-issues are available on GitHub.com and GHES 3.17+; relationships require GHES 3.19+.

Manage discussions with gh discussion

<img width="2784" height="1179" alt="discussion-view-monas-cafe-with-frame" src="https://github.com/user-attachments/assets/c625fe16-b625-4b24-b8b1-80e0c5336b8c" />

This release introduces the discussion command set for working with GitHub Discussions in gh:

# List discussions
gh discussion list

# View a discussion, its comments, or replies to a comment
gh discussion view 123 --comments

# Create a discussion
gh discussion create

# Edit a discussion
gh discussion edit 123

# Comment on a discussion
gh discussion comment 123

# Reply to a comment using its URL
gh discussion comment <url>

Run gh discussion --help for more information.

Equip your agents with new gh features

Teach your agents how to leverage new GitHub CLI features on release day by installing the gh skill:

# Install
gh skill install cli/cli gh --scope user

# Or update
gh skill update gh

What's Changed

✨ Features

• Add gh discussion command set (list, view, create, edit) as a preview by @babakks and @maxbeizer in #13541
• Add gh discussion comment to comment on and reply to discussions by @babakks in #13620
• Add Issues 2.0 support: issue types, sub-issues, and relationships by @BagToad in #13057
• Add gh skill list to inventory installed agent skills by @tommaso-moro in #13418
• Add --all flag to gh skill install to install every skill in a repository by @tommaso-moro in #13471
• Skip skills without metadata when running gh skill update --all by @tommaso-moro in #13469
• Alias gh extension uninstall to gh extension remove by @BagToad in #13599
• Auto-install official extensions in CI by @BagToad in #13581

🐛 Fixes

• fix(skill): support skill discovery in nested directories by @tommaso-moro in #13459

📚 Docs & Chores

• Bump Go to 1.26.4 by @github-actions[bot] in #13578
• Clean up deferred issue update helper by @BagToad in #13584
• Add terminal-mockup canvas extension for marketing screenshots by @BagToad in #13612
• Add gh discussion and Issues 2.0 reference to the gh skill, plus a README note by @BagToad in #13631

:dependabot: Dependencies

• chore(deps): bump golangci/golangci-lint-action from 9.2.0 to 9.2.1 by @dependabot in #13521
• chore(deps): bump github.com/gdamore/tcell/v2 from 2.13.9 to 2.13.10 by @dependabot in #13520
• chore(deps): bump github.com/mattn/go-colorable from 0.1.14 to 0.1.15 by @dependabot in #13572
• chore(deps): bump charm.land/bubbletea/v2 from 2.0.6 to 2.0.7 by @dependabot in #13595
• chore(deps): bump github/codeql-action from 4.36.0 to 4.36.1 by @dependabot in #13596
• chore(deps): bump actions/checkout from 6.0.2 to 6.0.3 by @dependabot in #13597

Full Changelog: https://github.com/cli/cli/compare/v2.93.0...v2.94.0