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/AssessmentQuestion.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class AssessmentQuestion extends Model
+{
+    public const TYPE_TEXT = 'text';
+
+    public const TYPE_TEXTAREA = 'textarea';
+
+    public const TYPE_NUMBER = 'number';
+
+    public const TYPE_INTEGER = 'integer';
+
+    public const TYPE_BOOLEAN = 'boolean';
+
+    public const TYPE_DATE = 'date';
+
+    public const TYPE_DATETIME = 'datetime';
+
+    public const TYPE_SINGLE_CHOICE = 'single_choice';
+
+    public const TYPE_MULTI_CHOICE = 'multi_choice';
+
+    public const TYPE_SCALE = 'scale';
+
+    public const TYPE_SCORE_ITEM = 'score_item';
+
+    public const TYPE_CALCULATED = 'calculated';
+
+    protected $table = 'care_assessment_questions';
+
+    protected $fillable = [
+        'template_id', 'code', 'section', 'label', 'help_text', 'answer_type',
+        'options', 'is_required', 'sort_order', 'score_key', 'validation',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'options' => 'array',
+            'validation' => 'array',
+            'is_required' => 'boolean',
+            'sort_order' => 'integer',
+        ];
+    }
+
+    public function template(): BelongsTo
+    {
+        return $this->belongsTo(AssessmentTemplate::class, 'template_id');
+    }
+
+    public function answers(): HasMany
+    {
+        return $this->hasMany(AssessmentAnswer::class, 'question_id');
+    }
+}