feat(agents): tarot agent — daily three-card draw (situation/action/outcome) (#120)

Draws 3 Major Arcana cards from a daily seed (user_id + date) so the
reading is stable within a day and unique per user. Card meanings and
action hints are precomputed in the agent; the orchestrator receives a
structured prompt snippet and is instructed to weave the themes into a
grounded, practical tip without explaining the cards.

No inferred params, no external data — requires only data:core consent.
TTL 6 h (refreshes at most twice daily).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ml/agents/registry.py

@@ -17,6 +17,7 @@ from .time_of_day import TimeOfDayAgent, MANIFEST as TIME_OF_DAY_MANIFEST
 from .recent_patterns import RecentPatternsAgent, MANIFEST as RECENT_PATTERNS_MANIFEST
 from .focus_area import FocusAreaAgent, MANIFEST as FOCUS_AREA_MANIFEST
 from .health_vitals import HealthVitalsAgent, MANIFEST as HEALTH_VITALS_MANIFEST
+from .tarot import TarotAgent, MANIFEST as TAROT_MANIFEST
 
 _REGISTERED: list[tuple[BaseAgent, AgentManifest]] = [
     (OverdueTaskAgent(), OVERDUE_TASK_MANIFEST),
@@ -25,6 +26,7 @@ _REGISTERED: list[tuple[BaseAgent, AgentManifest]] = [
     (RecentPatternsAgent(), RECENT_PATTERNS_MANIFEST),
     (FocusAreaAgent(), FOCUS_AREA_MANIFEST),
     (HealthVitalsAgent(), HEALTH_VITALS_MANIFEST),
+    (TarotAgent(), TAROT_MANIFEST),
 ]
 
 # Sanity check — agent_id and manifest.id must agree, otherwise the registry