gemini-cli v0.30.0-nightly: Core refactor, policy chains, actual reliability v0.30.0-nightly.20260224.544df749a

Moved session conversion to core, added Gemini 3.1 policy chain support, and actually fixed the retry/quota backoff situation. Your manual model picks now stick around on restart, Windows plan mode works, non-interactive mode stops silencing errors, and we hardened the OAuth server against unexpected requests. Ship it.