fix(clinical): red flags, one crisis rule, callback after a crisis, one table of numbers

Clinical review of the questionnaires (ADR-013):
- Red-flag block first in stage 1 (config/instruments/red_flags.yaml); any «Да» stops the
  questionnaire with an acute alert and the help screen of its category.
- One crisis rule: the crisis screen opens at a HIGH C-SSRS risk only; moderate stops and goes
  to a psychiatrist (24 h as a guide), low is a flag with the safety plan. PHQ-9 item 9 with a
  negative screener is a discrepancy flag; without a completed screener it asks the C-SSRS at once.
  config/questionnaire.yaml: cssrs_positive_policy graded (C01).
- Every crisis leaves a callback task for the doctor on duty (post_crisis_call, one per patient)
  and the app asks how the person is the next day, the safety plan one tap away.
- Routing: risk and flags first, scales second; PCL-5 >= 50 no longer means a priority
  appointment (pcl5_severe is moderate on the dashboard too).
- Crisis numbers live only in config/texts/crisis.yaml; texts and the agent prompt refer to them
  via {phone:<key>}. Fixes the children's helpline offered to adults by the chat agent.

Refs #92

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

config/texts/crisis.yaml

@@ -1,4 +1,6 @@
 # Кризисный скрипт (guardrail №2, issue #4). Отправляется ДОСЛОВНО при safety = acute; LLM не вызывается.
+# `resources` — ЕДИНСТВЕННАЯ таблица телефонов приложения: остальные тексты и промпты ссылаются на неё через
+# `{phone:<ключ>}` (app/core/safety.py::fill_phones). Источники и проверка — docs/clinical/crisis-contacts.md.
 # СТАТУС: черновик, утверждает психиатр (#8).
 #
 # Выбор варианта (app/core/safety.py::crisis_reply): `<audience>.<категория>` по порядку category_priority,
@@ -17,6 +19,11 @@ resources:
     name: "Психологическая помощь МЧС России"
     phone: "+7 (495) 989-50-50"
     note: "круглосуточно; стоимость звонка по тарифу оператора"
+  # For minors only (age gate stop text); not a general adult crisis line (docs/clinical/crisis-contacts.md).
+  child_helpline:
+    name: "Детский телефон доверия"
+    phone: "8-800-2000-122"
+    note: "для детей, подростков и родителей; бесплатно, анонимно"
   police:
     name: "Полиция"
     phone: "102"