feat: add source-owned combat mechanic programs

src/lib/builder/loadout.test.ts

@@ -9,6 +9,7 @@ describe('parseLoadoutDraft', () => {
 		const parsed = parseLoadoutDraft(draft);
 
 		expect(parsed).toEqual(draft);
+		expect(parsed?.calculationMode).toBe('maximum');
 		expect(parsed).not.toBe(draft);
 		parsed!.gear.Holster.level = 1;
 		expect(draft.gear.Holster.level).toBe(50);
@@ -22,20 +23,46 @@ describe('parseLoadoutDraft', () => {
 		expect(parseLoadoutDraft(retired)).toBeNull();
 	});
 
-	it('rejects a version 2 draft that does not contain exactly nine chips', () => {
+	it('rejects a version 4 draft that does not contain exactly nine chips', () => {
 		const draft = copyDraft();
 		draft.chips.pop();
 
 		expect(parseLoadoutDraft(draft)).toBeNull();
 	});
 
-	it('rejects a specialization missing a required current field', () => {
-		const draft = copyDraft() as unknown as { specialization: Record<string, unknown> };
-		delete draft.specialization.combatProfile;
+	it('rejects a draft missing the unified combat profile', () => {
+		const draft = copyDraft() as unknown as Record<string, unknown>;
+		delete draft.combatProfile;
 
 		expect(parseLoadoutDraft(draft)).toBeNull();
 	});
 
+	it('accepts a custom scenario and preserves its assumptions', () => {
+		const draft = copyDraft();
+		draft.calculationMode = 'custom';
+		draft.combatProfile.hitRate = 63;
+		draft.combatProfile.targetDistanceMeters = 28;
+		draft.conditionalEffects.relentless = {
+			mode: 'encounter',
+			inputs: {
+				alliesWithinRange: 3,
+				targetHasDebuff: true
+			}
+		};
+
+		expect(parseLoadoutDraft(draft)).toEqual(draft);
+	});
+
+	it('rejects drafts without the required calculation model', () => {
+		const missing = copyDraft() as unknown as Record<string, unknown>;
+		delete missing.calculationMode;
+		expect(parseLoadoutDraft(missing)).toBeNull();
+
+		const invalid = copyDraft() as unknown as Record<string, unknown>;
+		invalid.calculationMode = 'legacy';
+		expect(parseLoadoutDraft(invalid)).toBeNull();
+	});
+
 	it('rejects a specialization that carries retired unassigned chips', () => {
 		const draft = copyDraft() as unknown as { specialization: Record<string, unknown> };
 		draft.specialization.unassignedChips = [];