fix(cliproxy): preserve entitlement evidence on agy failures

tests/unit/cliproxy/quota-fetcher-antigravity-failure.test.ts

@@ -82,4 +82,134 @@ describe('Antigravity quota failure metadata', () => {
       fs.rmSync(tempHome, { recursive: true, force: true });
     }
   });
+
+  it('attaches entitlement evidence when project lookup returns an invalid 2xx payload', async () => {
+    const moduleId = Date.now() + Math.random();
+    const { fetchAccountQuota } = await import(
+      `../../../src/cliproxy/quota-fetcher?agy-invalid-project=${moduleId}`
+    );
+    const { getProviderAuthDir } = await import(
+      `../../../src/cliproxy/config-generator?agy-config=${moduleId}`
+    );
+    const fs = await import('node:fs');
+    const os = await import('node:os');
+    const path = await import('node:path');
+
+    const tempHome = fs.mkdtempSync(path.join(os.tmpdir(), 'ccs-agy-invalid-project-'));
+    const originalCcsHome = process.env.CCS_HOME;
+    process.env.CCS_HOME = tempHome;
+
+    try {
+      const authDir = getProviderAuthDir('agy');
+      fs.mkdirSync(authDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(authDir, 'antigravity-user@example.com.json'),
+        JSON.stringify({
+          type: 'antigravity',
+          email: 'user@example.com',
+          access_token: 'token',
+        })
+      );
+
+      const originalFetch = globalThis.fetch;
+      globalThis.fetch = (async () =>
+        new Response('', {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        })) as typeof fetch;
+
+      try {
+        const result = await fetchAccountQuota('agy', 'user@example.com');
+        expect(result.success).toBe(false);
+        expect(result.errorCode).toBe('provider_unavailable');
+        expect(result.entitlement).toMatchObject({
+          accessState: 'unknown',
+          capacityState: 'temporarily_unavailable',
+        });
+      } finally {
+        globalThis.fetch = originalFetch;
+      }
+    } finally {
+      if (originalCcsHome === undefined) {
+        delete process.env.CCS_HOME;
+      } else {
+        process.env.CCS_HOME = originalCcsHome;
+      }
+      fs.rmSync(tempHome, { recursive: true, force: true });
+    }
+  });
+
+  it('preserves live tier evidence when quota fetch fails after a successful project lookup', async () => {
+    const moduleId = Date.now() + Math.random();
+    const { fetchAccountQuota } = await import(
+      `../../../src/cliproxy/quota-fetcher?agy-invalid-models=${moduleId}`
+    );
+    const { getProviderAuthDir } = await import(
+      `../../../src/cliproxy/config-generator?agy-config=${moduleId}`
+    );
+    const fs = await import('node:fs');
+    const os = await import('node:os');
+    const path = await import('node:path');
+
+    const tempHome = fs.mkdtempSync(path.join(os.tmpdir(), 'ccs-agy-invalid-models-'));
+    const originalCcsHome = process.env.CCS_HOME;
+    process.env.CCS_HOME = tempHome;
+
+    try {
+      const authDir = getProviderAuthDir('agy');
+      fs.mkdirSync(authDir, { recursive: true });
+      fs.writeFileSync(
+        path.join(authDir, 'antigravity-user@example.com.json'),
+        JSON.stringify({
+          type: 'antigravity',
+          email: 'user@example.com',
+          access_token: 'token',
+        })
+      );
+
+      const originalFetch = globalThis.fetch;
+      let requestCount = 0;
+      globalThis.fetch = (async () => {
+        requestCount += 1;
+        if (requestCount === 1) {
+          return new Response(
+            JSON.stringify({
+              cloudaicompanionProject: { id: 'project-x' },
+              paidTier: { id: 'g1-pro-tier' },
+            }),
+            {
+              status: 200,
+              headers: { 'Content-Type': 'application/json' },
+            }
+          );
+        }
+
+        return new Response('', {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }) as typeof fetch;
+
+      try {
+        const result = await fetchAccountQuota('agy', 'user@example.com');
+        expect(result.success).toBe(false);
+        expect(result.entitlement).toMatchObject({
+          normalizedTier: 'pro',
+          rawTierId: 'g1-pro-tier',
+          rawTierLabel: 'Pro',
+          accessState: 'unknown',
+          capacityState: 'temporarily_unavailable',
+        });
+      } finally {
+        globalThis.fetch = originalFetch;
+      }
+    } finally {
+      if (originalCcsHome === undefined) {
+        delete process.env.CCS_HOME;
+      } else {
+        process.env.CCS_HOME = originalCcsHome;
+      }
+      fs.rmSync(tempHome, { recursive: true, force: true });
+    }
+  });
 });