fix: enforce source-backed offer type in bid preparation

tests/bid-terms.test.mjs

@@ -1,7 +1,19 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import {extractBidValidity,bidValidityForForm} from '../src/services/bidTerms.js';
+import {extractBidValidity,bidValidityForForm,extractBidType,bidTypeForForm} from '../src/services/bidTerms.js';
 import {qualifyAnalysis} from '../server/analysis-quality.mjs';
+test('offer type comes from explicit clauses and conflicting types remain unresolved',()=>{
+ const unit='İstekliler birim fiyat teklif vereceklerdir.';
+ const lump='TEKLİF TÜRÜ: ANAHTAR TESLİMİ GÖTÜRÜ BEDEL';
+ assert.equal(extractBidType(unit).type,'birim');
+ assert.equal(extractBidType(lump).type,'goturu');
+ assert.equal(extractBidType('Birim fiyat tablosu örneği. Götürü bedel teklif verilemez.').status,'not_found');
+ assert.equal(extractBidType('Kalem listesi bulunamadı.').type,null);
+ assert.equal(bidTypeForForm(unit,extractBidType(lump)).status,'conflict');
+ const result=qualifyAnalysis({},{text:lump});
+ assert.equal(result.procurementTerms.bidType.type,'goturu');
+ assert.equal(qualifyAnalysis({},{text:unit+' '+lump}).sourceReview.status,'partial');
+});
 test('bid validity is structured from source with exact clause evidence',()=>{
   const source='Teslimat 15 gün. TEKLİFLERİN GEÇERLİLİK SÜRESİ ihale tarihinden itibaren 120 (yüzyirmi) takvim günüdür.';
   const terms=extractBidValidity(source);