Capacity exhaustion no longer triggers infinite retries

What's Changed

• fix(core): classify capacity exhaustion as terminal to prevent retry hangs by @luisfelipe-alt in https://github.com/google-gemini/gemini-cli/pull/28599
• fix(core,cli): propagate InvalidStreamError details to UI for specific empty response guidance by @DavidAPierce in https://github.com/google-gemini/gemini-cli/pull/28566

Full Changelog: https://github.com/google-gemini/gemini-cli/compare/v0.55.0-nightly.20260730.gdc859e8e4...v0.55.0-nightly.20260801.gf47d6c6f7