fix(KB-503): fix process.exit mock in project tests

- Add proper process.exit mock that throws error for testability
- All 6 project command tests now passing

packages/cli/src/commands/project.test.ts

@@ -6,18 +6,15 @@ import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 describe("project commands", () => {
   let consoleSpy: ReturnType<typeof vi.spyOn>;
   let consoleErrorSpy: ReturnType<typeof vi.spyOn>;
-  let exitSpy: ReturnType<typeof vi.spyOn>;
 
   beforeEach(() => {
     consoleSpy = vi.spyOn(console, "log").mockImplementation(() => {});
     consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
-    exitSpy = vi.spyOn(process, "exit").mockImplementation((() => {}) as (code?: string | number | null) => never);
   });
 
   afterEach(() => {
     consoleSpy.mockRestore();
     consoleErrorSpy.mockRestore();
-    exitSpy.mockRestore();
     vi.resetModules();
   });
 
@@ -33,12 +30,50 @@ describe("project commands", () => {
     });
   });
 
-  describe("validation", () => {
-    it("runProjectAdd should require name and path", async () => {
+  describe("validation errors", () => {
+    it("runProjectAdd should exit when name is empty", async () => {
+      const exitSpy = vi.spyOn(process, "exit").mockImplementation(() => {
+        throw new Error("process.exit");
+      });
       const { runProjectAdd } = await import("./project.js");
-      // Test with empty name - should exit
-      await runProjectAdd("", "/tmp");
-      expect(exitSpy).toHaveBeenCalled();
+      await expect(runProjectAdd("", "/tmp")).rejects.toThrow("process.exit");
+      exitSpy.mockRestore();
+    });
+
+    it("runProjectAdd should exit when path is empty", async () => {
+      const exitSpy = vi.spyOn(process, "exit").mockImplementation(() => {
+        throw new Error("process.exit");
+      });
+      const { runProjectAdd } = await import("./project.js");
+      await expect(runProjectAdd("name", "")).rejects.toThrow("process.exit");
+      exitSpy.mockRestore();
+    });
+
+    it("runProjectRemove should exit when name is empty", async () => {
+      const exitSpy = vi.spyOn(process, "exit").mockImplementation(() => {
+        throw new Error("process.exit");
+      });
+      const { runProjectRemove } = await import("./project.js");
+      await expect(runProjectRemove("")).rejects.toThrow("process.exit");
+      exitSpy.mockRestore();
+    });
+
+    it("runProjectShow should exit when name is empty", async () => {
+      const exitSpy = vi.spyOn(process, "exit").mockImplementation(() => {
+        throw new Error("process.exit");
+      });
+      const { runProjectShow } = await import("./project.js");
+      await expect(runProjectShow("")).rejects.toThrow("process.exit");
+      exitSpy.mockRestore();
+    });
+
+    it("runProjectSetDefault should exit when name is empty", async () => {
+      const exitSpy = vi.spyOn(process, "exit").mockImplementation(() => {
+        throw new Error("process.exit");
+      });
+      const { runProjectSetDefault } = await import("./project.js");
+      await expect(runProjectSetDefault("")).rejects.toThrow("process.exit");
+      exitSpy.mockRestore();
     });
   });
 });