chore: prepare v1.27.3 release and guard template publishing

.github/release-notes/v1.27.2.md

@@ -0,0 +1,22 @@
+> **Correction (2026-09-23):** v1.27.2 did not fix every push notification template. Bloom, Ember, and Heritage still used the old commit ID path and can fail to render push notifications on Gitea 1.27.1+. Use v1.27.3 for the fix.
+
+FEATURES
+
+- THEMES (Aurora)
+    - Add `email-text` class to release template paragraphs for consistent typography with the rest of the theme
+
+BUGFIXES
+
+- THEMES
+    - Update push commit data paths in seven themes for Gitea 1.27.1 compatibility (`.ID` → `.UserCommit.GitCommit.ID`); see the correction above for the three remaining themes
+    - Replace `rgba()` colors with `#RRGGBBAA` hex notation across all 10 themes
+
+DOCS
+
+- Track Gitea 1.27.0, 1.27.1, and 1.27.2 compatibility
+- Keep English and Simplified Chinese README and CONTRIBUTING files
+
+
+---
+
+**Full Changelog:** [v1.0.1...v1.27.2](https://github.com/KenanZhu/GiteaMailTemplates/compare/v1.0.1...v1.27.2)

.github/release-notes/v1.27.3.md

@@ -0,0 +1,22 @@
+FEATURES
+
+- RELEASE
+    - Include English and Simplified Chinese README and CONTRIBUTING files in the release archives
+    - Use reviewed release notes in the publishing workflow
+
+BUGFIXES
+
+- THEMES (Bloom, Ember, Heritage)
+    - Fix pull request push notification commit links and abbreviated hashes for Gitea 1.27.1–1.27.3 by reading `.UserCommit.GitCommit.ID`
+- CI
+    - Add a push notification regression test covering all 10 themes and run Go tests before packaging a release
+
+DOCS
+
+- Verify compatibility with Gitea 1.27.3; its mail templates, mailer, and locale files are unchanged from 1.27.2
+- Correct the compatibility matrix to distinguish the affected v1.27.2 archive from this fixed release
+
+
+---
+
+**Full Changelog:** [v1.27.2...v1.27.3](https://github.com/KenanZhu/GiteaMailTemplates/compare/v1.27.2...v1.27.3)