docs(release): keep CHANGELOG entries under Unreleased while betas go out

docs/RELEASING.md

@@ -56,7 +56,9 @@ retries).
 
 1. **Assemble the release branch.** Create `release/vX.Y.Z` and merge the
    feature/fix branches for this release into it. Everything below happens on
-   that branch, before it reaches `main`.
+   that branch, before it reaches `main`. To ship betas first, follow
+   [Cutting a beta](#cutting-a-beta) from here and come back to step 2 when
+   going stable.
 2. **Update `CHANGELOG.md`.** Move the `## [Unreleased]` items under a new
    `## [X.Y.Z]` heading (Keep a Changelog format). The text between that heading
    and the next `## [` becomes the Gitea and Codeberg release notes. The
@@ -65,7 +67,8 @@ retries).
    `scripts/version_info.sh` prints) in `app/build.gradle.kts`. **This bump is what triggers the release** when the
    branch merges to `main`.
    Then write this version's **"What's New"** by hand:
-   `fastlane/metadata/android/<locale>/changelogs/<versionCode>.txt`, one per
+   `fastlane/metadata/android/<locale>/changelogs/<versionCode>.txt` (e.g.
+   `1010099.txt` for 1.1.0), one per
    shipped locale, each a short summary **under 500 characters** — F-Droid and
    Play both publish these files, and Play rejects a longer one. It is not a
    copy of the CHANGELOG.md section. `scripts/sync_changelog_to_fastlane.sh`
@@ -108,7 +111,9 @@ and to the stable release.
    (`scripts/version_info.sh` prints it; `1.1.0-beta.1` → `1010001`).
    No What's New file — betas don't ship to the stores. Notes come from a
    `## [X.Y.Z-beta.N]` section of `CHANGELOG.md` if you write one, otherwise
-   from `## [Unreleased]`.
+   from `## [Unreleased]`. So keep the entries under `## [Unreleased]` while
+   betas are going out and only move them to `## [X.Y.Z]` when going stable:
+   once they're moved, a beta's notes come out empty.
 2. **Optionally verify it on a device** with `scripts/verify-release.sh`, as for
    a stable release.
 3. **Push the branch to Codeberg.** When it reaches Gitea, `beta.yaml` sees a