fix(bot): close dialog engine gaps (C-SSRS repeat, scale intros, button payloads, step timeout)

- No same-day C-SSRS repeat: a risk screen completed within cssrs_cooldown_hours is not queued again
  after PHQ-9 item 9 >= 1 (scale crisis path, rule schedule_scale, scale_due); crisis script and alerts stay.
- Scale intro registry: register_scale_intro(scale_id, text_or_fn); start_scale(intro=None) uses it.
  veteran_daily migrated from per-scale on_enter hooks.
- Prefix triggers "button:<prefix>:*" with trigger_payload(event); medication buttons carry the dose
  (med:taken:<dose_id>, ...), med_pending dropped; payload-less legacy buttons answer as stale.
- Abandoned-step timeout: settings.abandon_after_hours (default 6 h) returns abandonable states
  (daily.*, meds.*, scale.* not in onboarding) to idle before the next event; never in crisis or with intake on.

Refs #56

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

tests/test_dialog_veteran_days.py

@@ -292,13 +292,13 @@ async def test_andrey_13_days(andrey: RuleMonitoring) -> None:
         dose_id = await new_dose(clock.today())
         reminder = await a.system("med_reminder", dose_id=dose_id, drug="сертралин", dose="50 мг")
         assert "сертралин 50 мг" in reminder[0].text
-        assert buttons(reminder) == ["med:taken", "med:skip", "med:side_effects"]
+        assert buttons(reminder) == [f"med:taken:{dose_id}", f"med:skip:{dose_id}", f"med:side_effects:{dose_id}"]
         if taken:
-            r += await a.press("med:taken")
+            r += await a.press(f"med:taken:{dose_id}")
         else:
-            skip = await a.press("med:skip")
-            assert "med:skip_reason:quit" in buttons(skip)
-            r += skip + await a.press("med:skip_reason:quit")
+            skip = await a.press(f"med:skip:{dose_id}")
+            assert f"med:skip_reason:quit:{dose_id}" in buttons(skip)
+            r += skip + await a.press(f"med:skip_reason:quit:{dose_id}")
 
         # --- day 7: scheduled scales (PCL-5 = 44, PHQ-9 = 13, item 9 = 0) with friendly intros
         if day == 7:
@@ -359,7 +359,10 @@ async def test_andrey_13_days(andrey: RuleMonitoring) -> None:
     r = await a.answer_scale("phq9", [2] * 8 + [2])  # total 18, item 9 = 2
     assert any(x.kind == "crisis" for x in r) and any(x.kind == "safety_plan" for x in r)
     st, data = await state()
-    assert data["crisis"]["open"] is True and st in ("crisis", "scale.cssrs_screen")
+    # C-SSRS was completed minutes ago: item 9 opens the crisis but does not ask the same screen again (#56).
+    assert data["crisis"]["open"] is True and st == "crisis" and not data.get("pending_scales")
+    async with session.get_clinical_session() as s:
+        assert len(await repo.list_scale_results(s, TOKEN, "cssrs_screen")) == 1
     acute = [x for x in await open_alerts() if x.level == "acute"]
     assert [x.code for x in acute] == ["phq9_item9"]
     assert patient_status(AlertLevel[x.level.upper()] for x in await open_alerts()).color == COLORS[12]