docs(gh-skill): document gh issue develop --checkout --worktree - #14265

Description

The gh agent skill (skills/gh/SKILL.md) documents useful gh invocation patterns for agents, including checking a PR out into a git worktree with gh pr checkout <n> --worktree <path>. The equivalent capability for issues, gh issue develop <n> --checkout --worktree <path>, was not documented.

This adds a note covering gh issue develop --checkout and the --worktree flag, including its constraints, so agents know they can create a linked branch for an issue and check it out into a worktree instead of switching the current branch.

How did you test this change?

This is a documentation-only change to a skill Markdown file, so there is no runtime behavior to exercise. I verified the documented flags and constraints against the command source in pkg/cmd/issue/develop/develop.go:

• --checkout creates and checks out the linked branch.
• --worktree <path> checks the branch out into a worktree.
• --worktree requires --checkout, cannot be blank, and is mutually exclusive with --list.

Key points

Placed the new note directly below the existing gh pr checkout --worktree entry in the "Other notes" section to keep the two worktree patterns together.

Notes for reviewers

Start in skills/gh/SKILL.md, "Other notes" section. The wording mirrors the adjacent pr checkout --worktree note for consistency.

Authorship and follow-up

Who wrote this:

• A human wrote it.
• An agent wrote it under close human direction.
• An agent wrote it independently, and no human has guided the implementation beyond the initial prompt.

Who answers review comments:

• @babakks will read and reply directly.
• An agent will draft replies and @username will read them before they are posted.
• Nobody has explicitly committed to replying.