v1.9.0

Trust-and-recovery release: chat turns and artifacts never silently vanish, cost tracking shows one consistent number everywhere, artifacts gain a real version history, and ask_user can offer multiple answers.

Features

• Artifact version history — every save snapshots the version it replaces (up to 10), with new artifact_history / artifact_restore tools so an accidental overwrite is recoverable. Gallery cards now show the updated time + a version badge. (#677)
• ask_user multi-select — opt-in multiSelect lets you toggle several answer pills and Send, instead of one-click-and-done. Single-select is unchanged. (#676)

Fixes

• Durable chat turns — a user message is now persisted at run start, so an abort / reload / queued send mid-stream can't lose it (continued-session prompts no longer disappear). Queued messages survive a reload; the scroll stays pinned on send. (#673)
• Cost tracking, one source of truth — the footer, the dashboard "today" tile, and the 14-day chart now agree (local-timezone day buckets); the histogram ends on today instead of stale dates; per-thread cost reflects the full thread; headline run counts are your chat turns (voice + sub-runs counted separately). (#674)