feat(assessments): layered clinical assessment engine end-to-end

Add a template-driven assessment system with universal intake, clinical
pathways, disease instruments (stroke MVP + extended, diabetes, and ten
specialty packs), scoring, patient outcome trends, REST/API + FHIR
export, and Enterprise org-level assessment analytics. Seed packs and
design/licensing docs ship for deploy and pre-GA review.

app/Models/Visit.php

@@ -74,6 +74,11 @@ class Visit extends Model
         return $this->hasMany(Consultation::class, 'visit_id');
     }
 
+    public function assessments(): HasMany
+    {
+        return $this->hasMany(Assessment::class, 'visit_id');
+    }
+
     public function bill(): HasOne
     {
         return $this->hasOne(Bill::class, 'visit_id');