Agent Skills: ngit-pr

How to create, review, revise, and merge pull requests in this repo, which can be published TWO ways — GitHub (the `gh` CLI) and git-over-nostr (the `ngit` CLI, where PRs are nostr **proposals** reviewed on gitworkshop.dev). Use whenever a task involves opening/updating/merging a PR by either mechanism, the `pr/feat/*` branches, the `ngit` or `gh` CLIs, gitworkshop.dev, or a `nostr://` remote. Remote names vary per clone (and a collaborator may have only one) — this skill identifies remotes by URL, and covers the three-mains alignment gate the nostr flow depends on.