Fix Cursor AI Terminal Freezing Caused by Powerlevel10k Using CURSOR_AGENT Variable

Users running Powerlevel10k or Powerlevel9k shell themes in the Cursor AI editor encounter a known compatibility issue where the agent hangs indefinitely after executing terminal commands, requiring manual intervention each time. The root cause is that these themes interfere with Cursor's command-completion detection mechanism, causing truncated or misformatted output that the agent cannot parse correctly. Cursor's official documentation acknowledges the problem and recommends disabling heavy prompts during agent sessions using the CURSOR_AGENT environment variable in the shell configuration. However, users combining Oh-My-Zsh with Powerlevel10k found that the official fix alone caused themes to break in regular terminals as well. An improved configuration that conditionally skips theme initialization only when CURSOR_AGENT is set — while still sourcing oh-my-zsh normally otherwise — resolves both issues cleanly.