test(08-01): add failing tests for candidate status field

- 5 tests: create with/without status, update status, getThreadWithCandidates includes status
- Test helper updated with status column in thread_candidates CREATE TABLE

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/services/thread.service.test.ts

@@ -217,6 +217,87 @@ describe("Thread Service", () => {
 		});
 	});
 
+	describe("candidate status", () => {
+		it("createCandidate without status returns a candidate with status 'researching'", () => {
+			const thread = createThread(db, { name: "Test Thread", categoryId: 1 });
+			const candidate = createCandidate(db, thread.id, {
+				name: "No Status",
+				categoryId: 1,
+			});
+
+			expect(candidate.status).toBe("researching");
+		});
+
+		it("createCandidate with status 'ordered' returns a candidate with status 'ordered'", () => {
+			const thread = createThread(db, { name: "Test Thread", categoryId: 1 });
+			const candidate = createCandidate(db, thread.id, {
+				name: "Ordered Item",
+				categoryId: 1,
+				status: "ordered",
+			});
+
+			expect(candidate.status).toBe("ordered");
+		});
+
+		it("updateCandidate can change status from 'researching' to 'ordered'", () => {
+			const thread = createThread(db, { name: "Test Thread", categoryId: 1 });
+			const candidate = createCandidate(db, thread.id, {
+				name: "Status Change",
+				categoryId: 1,
+			});
+
+			expect(candidate.status).toBe("researching");
+
+			const updated = updateCandidate(db, candidate.id, {
+				status: "ordered",
+			});
+
+			expect(updated?.status).toBe("ordered");
+		});
+
+		it("updateCandidate can change status from 'ordered' to 'arrived'", () => {
+			const thread = createThread(db, { name: "Test Thread", categoryId: 1 });
+			const candidate = createCandidate(db, thread.id, {
+				name: "Arriving Item",
+				categoryId: 1,
+				status: "ordered",
+			});
+
+			const updated = updateCandidate(db, candidate.id, {
+				status: "arrived",
+			});
+
+			expect(updated?.status).toBe("arrived");
+		});
+
+		it("getThreadWithCandidates includes status field on each candidate", () => {
+			const thread = createThread(db, { name: "Status Thread", categoryId: 1 });
+			createCandidate(db, thread.id, {
+				name: "Candidate A",
+				categoryId: 1,
+			});
+			createCandidate(db, thread.id, {
+				name: "Candidate B",
+				categoryId: 1,
+				status: "ordered",
+			});
+
+			const result = getThreadWithCandidates(db, thread.id);
+			expect(result).toBeDefined();
+			expect(result?.candidates).toHaveLength(2);
+
+			const candidateA = result?.candidates.find(
+				(c) => c.name === "Candidate A",
+			);
+			const candidateB = result?.candidates.find(
+				(c) => c.name === "Candidate B",
+			);
+
+			expect(candidateA?.status).toBe("researching");
+			expect(candidateB?.status).toBe("ordered");
+		});
+	});
+
 	describe("resolveThread", () => {
 		it("atomically creates collection item from candidate data and archives thread", () => {
 			const thread = createThread(db, { name: "Tent Decision", categoryId: 1 });