Adds a project-scoped agent skill at
`.agents/skills/zed-cherry-pick/SKILL.md` that walks an agent through
cherry-picking a merged PR into Zed's `preview` or `stable` release
branch — including the case where the automated `cherry_pick` GitHub
Actions workflow failed due to a merge conflict.
Captures the conventions enforced by `script/cherry-pick` (branch
naming, PR title/body format) and the gotchas around discovering the
current channel→branch mapping, non-interactive git in agent
environments, and worktree index locks.
Release Notes:
- N/A
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Co-authored-by: Martin Ye <martin@zed.dev>
Co-authored-by: Ben Kunkle <ben.kunkle@gmail.com>
