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>

tests/test_api_patient_web.py

@@ -169,8 +169,8 @@ async def test_demo_flag_opens_intake_in_the_engine(client: AsyncClient, monkeyp
     await press()
     await press("consent:yes")
     buttons = await press("age:adult")
-    # Stage 1 starts with PHQ-2, in the order of the MVP questionnaire.
-    assert any(b.startswith("iq:") and ":phq9_1:" in b for b in buttons)
+    # Stage 1 starts with the red-flag block, then the order of the MVP questionnaire.
+    assert any(b.startswith("iq:") and ":rf_psychosis:" in b for b in buttons)
     assert "intake:help" in buttons and "intake:pause" in buttons
     q = (await client.get(f"/api/v1/me/{persona}/today")).json()["questionnaires"]
     assert q["enabled"] and q["intake"] == "active"
@@ -214,7 +214,7 @@ async def test_stage_one_starts_without_modules(client: AsyncClient, monkeypatch
     assert (await client.get(f"/api/v1/me/{token}/today")).json()["questionnaires"]["enabled"]
     await press()
     await press("consent:yes")
-    assert any(":phq9_1:" in b for b in await press("age:adult"))
+    assert any(":rf_psychosis:" in b for b in await press("age:adult"))
 
 
 async def test_patient_app_has_its_own_demo_personas(client: AsyncClient) -> None: