docs(agents): document develop version lag and release back-merge step
The UI version comes from `git describe --tags`, which resolves the nearest tag in the current commit's ancestry. Release tags are created on main's merge commit, which is not in develop's history, so develop builds keep reporting the previous tag (e.g. v0.91.0-NNN) until main is merged back. Add step 7 (back-merge main -> develop) to the "Cutting a release" checklist and a subsection explaining why develop lags and how to fix it.
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@@ -277,6 +277,15 @@ The git tag is the source of truth for the displayed version (UI reads `git desc
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4. Update `CHANGELOG.md` (Keep a Changelog format): add a `## [X.Y.Z] - YYYY-MM-DD` section summarising `git log vPREV..HEAD --no-merges` grouped by type (Breaking / Added / Changed / Fixed / Removed), and add the `compare/vPREV...vX.Y.Z` link at the bottom. Fold the bump + changelog into the release commit.
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5. Tag the release commit with a **lightweight** tag (existing release tags are lightweight): `git tag vX.Y.Z`.
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6. Push commit and tag: `git push origin main && git push origin vX.Y.Z`. Pushing the `v*` tag triggers `release.yml` (multi-arch GHCR images + a draft GitHub Release).
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7. **Back-merge the release into `develop`** so develop builds report the new version: `git checkout develop && git merge --no-ff main && git push origin develop` (push to Gitea as well if that is the canonical remote).
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#### Why develop keeps showing the *previous* version (and why step 7 matters)
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The UI version is `git describe --tags --always` (see `vite.config.ts`), which walks **backwards from the current commit** and picks the **nearest tag reachable in that commit's ancestry**, then appends `-<commits-since-tag>-g<short-hash>`.
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The release tag (`vX.Y.Z`) is created on **`main`'s release merge commit**, and that commit is **not** in `develop`'s history. So until the release is back-merged, `git describe` on `develop` cannot see the new tag and falls back to the *previous* reachable tag. Result: every develop build — and the `ghcr.io/vvzvlad/gitmost:develop` image — keeps reporting e.g. `v0.91.0-NNN-g<hash>` even though `main` is already tagged `v0.93.0`. This is the classic git-flow pitfall: the version on `develop` does **not** advance just because a release was tagged on `main`.
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Back-merging `main → develop` (step 7) pulls the tagged release commit into `develop`'s ancestry, after which develop builds correctly show `vX.Y.Z-NNN-g<hash>`. If `develop` already drifted (release tagged but never back-merged), just run step 7 now — no new tag is needed.
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## Planning docs
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