feat: validate transport incident requires truck_id

Add 'transport' to INCIDENT_TYPES; add truck_id field to IncidentInput;
reject transport submissions missing truck_id.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ

tests/lib/incidents/validate.test.ts

@@ -42,6 +42,30 @@ describe('validateIncidentInput', () => {
     expect(result.ok).toBe(false)
     expect(result.errors).toContain('incident_type is invalid')
   })
+
+  it('accepts transport type when truck_id is present', () => {
+    const r = validateIncidentInput({
+      zone_token: 'z',
+      incident_type: 'transport',
+      description: 'Truck clipped the dock frame reversing into bay 3.',
+      injury_involved: false,
+      asset_involved: false,
+      truck_id: 'truck-uuid',
+    } as any)
+    expect(r.ok).toBe(true)
+  })
+
+  it('rejects transport type without a truck_id', () => {
+    const r = validateIncidentInput({
+      zone_token: 'z',
+      incident_type: 'transport',
+      description: 'Truck clipped the dock frame reversing into bay 3.',
+      injury_involved: false,
+      asset_involved: false,
+    } as any)
+    expect(r.ok).toBe(false)
+    expect(r.errors).toContain('truck_id is required for transport incidents')
+  })
 })
 
 describe('validateTypeDetails', () => {