临床背景:
  根管治疗后牙变脆(髓腔抽空 + 牙体含水量下降),不戴冠保护 2-3 年内
  ~30% 概率牙冠折裂(literature: Caplan & Weintraub 1997 等)
  所以"根管完成 + 牙体充填" 不算真闭环,必须 + "冠修复" 才算完整治疗

改动:
  1. canonical-codes.ts:
     - TreatmentLifecycle 加 requiresCrownProtection?: boolean
     - 新加 lifecycle = 'linear_then_crown' (maxStage=5, 需冠保护)
     - endodontic.lifecycle 'linear' → 'linear_then_crown'
  2. chain-composer:
     - 新加 hasCrownProtection(bucketTooth, byType, anchor) helper
       检查同牙位 prosthodontic actual,treat_stages 含 crown_restoration/post_core
       fallback subtype.includes('冠'/'桩核')
     - S5 闸口加 crownOk 条件:lifecycle.requiresCrownProtection 时必须满足
     - buildStageNodes 透 crownOk 给 S5 节点 → hint "待冠保护(...防牙冠折裂)"

验证(杨光宗 27 K04):
  改前:closed stage=5(根管+充填+复诊 触发 S5 → 误闭环)
  改后:ongoing stage=4 → S5 "未闭环 · 待冠保护(根管后建议戴冠,防牙冠折裂)"

副作用:其他做了根管但没戴冠的患者也会从 closed → ongoing
  → 客服可视化看到缺口,适合补做"根管后冠修复召回"scenario(future)

不影响 SQL recall(scenario 仍按 treatment_initiation_recall ⑤a actual overlap 排除,
K04 27 有 endodontic actual 仍被排除,不会重新进召回池;
真正"该补冠"的召回是另一个 scenario,后续加)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>