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## What changed - Give unnamed TUI threads an immediate provisional title from the first user message, then replace it asynchronously with a normalized generated title. - Preserve manual renames by applying a generated title only while the provisional title is still current, and keep automatic rename notifications out of the transcript. - Run title generation in a bounded ephemeral structured request that preserves custom permission profiles, otherwise uses read-only access, and disables tools and MCP servers. ## Testing - Cover prompt and response bounds, Unicode-safe truncation, title normalization, manual-rename races, silent automatic updates, permission preservation, and structured-response failures. GitOrigin-RevId: 7ed73522f4f6c65a005f65f3a903974d8419e312