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Fixes #20792 ## Why `/goal`-first threads are valid resumable threads, but they can be missing from `codex resume` and app recents because discovery depends on metadata derived from a normal first user message. PR #21489 attempted to fix this by using the goal objective as `first_user_message`. Review feedback pointed out that `first_user_message` does more than provide visible text today: it gates listing, supplies preview text, and participates in deciding whether a later title should surface as a distinct thread name. Reusing it for the goal objective could leave a `/goal`-first thread with `first_user_message=<goal>` and `title=<later prompt>`, even though the goal should only provide the initial visible preview. This PR follows that feedback by and keeps the `first_user_message` as is but introduces a new `preview` field to separate concerns. The `preview` field is populated from the first user message or the goal objective. We can extend it in the future to include other sources. ## What Changed - Added internal thread `preview` metadata in `codex-state`, including a SQLite migration that backfills from `first_user_message` and from existing `thread_goals` objectives when needed. - Treated `ThreadGoalUpdated` as preview-bearing metadata so goal-first threads can be listed and searched without mutating `first_user_message`. - Updated rollout listing, state queries, thread-store conversion, and app-server mapping to use preview metadata while continuing to expose the existing public `preview` field. - Preserved title/name distinctness behavior around literal `first_user_message`, so a later normal prompt after `/goal` does not surface as a separate name just because the goal supplied the initial preview. - Preserved compatibility for older/internal metadata writes by deriving preview from `first_user_message` when explicit preview metadata is absent. ## Verification - Manually verified that a thread that starts with a `/goal <objective>` shows up in the resume picker.