Part 2 of #144. - The varga-segments scan gains opt-in stability_items: lagna degree, Sripati cusp signs, Moon sign / nakshatra / pada / house per minute, plus a historical-timezone check. The precheck requests D1/D9/D10 with it. - Chart page shows nine computed items (一致 / 有变化) only for a range the user gave, the verbatim comparison sentence, a verify-first block for the conditions stored data can show, and the verbatim Dasha boundary sentence. - Precheck sends the chart's ayanamsa and node mode and drops replies with other settings; the endpoint honours node_mode. candidate_time_sensitivity_scan and flexible_birth_time_profile take no defaults (BUG-1515). - 只记得时辰 third question, stored in birth_time_clue; no migration. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DbBXoyeZrYn6ryNcSe5Y2Y