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/ClinicalPathway.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Support\Str;
+
+/** Platform catalog pathway (no owner_ref). */
+class ClinicalPathway extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'care_clinical_pathways';
+
+    protected $fillable = [
+        'uuid', 'code', 'name', 'description', 'match_rules',
+        'is_active', 'sort_order', 'meta',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'match_rules' => 'array',
+            'meta' => 'array',
+            'is_active' => 'boolean',
+            'sort_order' => 'integer',
+        ];
+    }
+
+    protected static function booted(): void
+    {
+        static::creating(function (ClinicalPathway $pathway) {
+            if (! $pathway->uuid) {
+                $pathway->uuid = (string) Str::uuid();
+            }
+        });
+    }
+
+    public function getRouteKeyName(): string
+    {
+        return 'uuid';
+    }
+
+    public function templates(): HasMany
+    {
+        return $this->hasMany(PathwayTemplate::class, 'pathway_id')->orderBy('sort_order');
+    }
+
+    public function patientPathways(): HasMany
+    {
+        return $this->hasMany(PatientPathway::class, 'pathway_id');
+    }
+
+    public function scopeActive(Builder $query): Builder
+    {
+        return $query->where('is_active', true);
+    }
+
+    public static function findByCode(string $code): ?self
+    {
+        return static::query()->where('code', $code)->where('is_active', true)->first();
+    }
+}