Add RELEASING.md

Author: fvictorio

RELEASING.md

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+# Releasing
+
+This project uses GitHub Actions to publish to npm. The publish workflow runs on two triggers:
+
+- Manually via `workflow_dispatch`
+- Automatically when a GitHub Release is published
+
+## Steps to cut a release
+
+1. **Decide the new version**. Use `pnpm version` to bump the version and create a git tag for it. Commit and push the change and the tag.
+2. **Create a GitHub release**. Go to the tags page and create a release using the pushed tag.
+
+## npm dist-tags
+
+The workflow chooses the npm tag automatically based on the version string:
+
+- `*-alpha.*` → published under `alpha`
+- `*-beta.*` → published under `beta`
+- `*-rc.*` → published under `next`
+- Everything else → `latest`
+
+So, for prereleases, remember to add the correct suffix to the version (e.g. `1.2.3-beta.0`).