feat(cli): add /bug-memory command and auto-capture heap snapshot in /bug#25639

Anjaligarhwal wants to merge 2 commits intogoogle-gemini:maingoogle-gemini/gemini-cli:mainfrom

Anjaligarhwal:feat/cli/bug-memory-commandAnjaligarhwal/gemini-cli:feat/cli/bug-memory-commandCopy head branch name to clipboard