v1.12.3

Fixes

• Prevent ulw.sendAtMention / Cmd+Alt+L from opening a new configured terminal surface after sending an @mention.
• Keep focus routing on the intended existing ULW target, including terminal-focus cwd fallback.
• Add VS Code extension-host regressions for existing target, no-target, terminal-focus fallback, and ulw.sendAllOpenFiles paths.

Verification

• Publish workflow completed successfully for VS Code Marketplace and Open VSX.