docs(changelog): sync compare-links for the 0.94.0 release (#258)

The [Unreleased] compare link still pointed at v0.93.0 even though the
0.94.0 release section already exists, and there was no [0.94.0]
link-reference at all (the header was unresolvable). Point [Unreleased] at
v0.94.0...HEAD and add [0.94.0]: v0.93.0...v0.94.0 so every version header
resolves. closes #258

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -514,6 +514,7 @@ knowledge layer, an embedded MCP server, and the Gitmost rebrand.
 - Build: drop the private EE submodule, retarget CI to GHCR, and update the
   Docker image to the GHCR registry.
 
-[Unreleased]: https://github.com/vvzvlad/gitmost/compare/v0.93.0...HEAD
+[Unreleased]: https://github.com/vvzvlad/gitmost/compare/v0.94.0...HEAD
+[0.94.0]: https://github.com/vvzvlad/gitmost/compare/v0.93.0...v0.94.0
 [0.93.0]: https://github.com/vvzvlad/gitmost/compare/v0.91.0...v0.93.0
 [0.91.0]: https://github.com/vvzvlad/gitmost/compare/v0.90.1...v0.91.0