docs(release): expand v4.2.3 CHANGELOG and add OmO logo to README.ru.md

- CHANGELOG: detail BUG-A/B (team-mode delivery), BUG-C/D
  (runtime-fallback event/finish blind spots), BUG-E (parent-wake
  same-source reservation), BUG-F (markerless workspace rules); the
  packages/rules-core and packages/ast-grep-mcp extractions; the
  prompt-async-gate hold default change; the new symlink-escape security
  fix; the rules-core isolation note; and the v4.3.0 deferred items
  (prompt-async-gate.ts split, @ast-grep/napi stale dep cleanup).
- README.ru.md: add the OmO logo block so the Russian README matches
  README.md / README.ja.md / README.ko.md / README.zh-cn.md.

README.ru.md

@@ -31,6 +31,8 @@
 
 <div align="center">
 
+<a href="https://github.com/code-yeongyu/oh-my-openagent#oh-my-openagent"><img src="./.github/assets/omo-logo.png" alt="OmO" width="200" /></a>
+
 [![Oh My OpenAgent](./.github/assets/hero.jpg)](https://github.com/code-yeongyu/oh-my-openagent#oh-my-openagent)
 
 [![Preview](./.github/assets/omo.png)](https://github.com/code-yeongyu/oh-my-openagent#oh-my-openagent)