Summaries now contain only characters you could type on a keyboard. Em dashes, curly quotes and the ellipsis character are gone: the default prompt forbids them in all 11 languages, and a cleanup pass (sanitizeTypography) normalizes every Gemini reply regardless of prompt.
Prompt migration: PROMPT_GENERATION 4; stored prompts that exactly match a 1.5.2-1.5.4 default are migrated to the new default. Customized prompts are never touched.
Also fixed: the "improved default prompt" notice appeared for prompts that were customized after the update. Saving the settings now marks the notice as seen.