v3.9.1

What's Changed

• release: v3.9.1 reliability hotfix by @baileyh8 in #100
• fix: abandon stale card sessions on interrupt to prevent stuck "生成中" by @colinaaa in #93
• fix(session): guard _prepare_completed_answer from archiving full answer as reasoning by @colinaaa in #97
• docs: finalize v3.9.1 release state by @baileyh8 in #101

Full Changelog: v3.9.0...v3.9.1