test(e2e): mock gamma-api /teams endpoint (MMQA-1800)

The main merge brought in TeamsCache (app/components/UI/Predict/
providers/polymarket/TeamsCache.ts) which fetches
gamma-api.polymarket.com/teams?league=...&abbreviation=... when
rendering sports markets that have team metadata (NBA, NFL, etc.).

Adds:
- POLYMARKET_TEAMS_MOCKS function in polymarket-mocks.ts (returns []),
  wired into POLYMARKET_COMPLETE_MOCKS so predict specs are covered.
- Default GET matcher in defaults/polymarket-apis.ts so non-predict
  specs that pass through Explore don't leak when team-aware markets
  render. Empty array is safe — TeamsCache short-circuits on
  non-array responses.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: chrisleewilcox

tests/api-mocking/mock-responses/defaults/polymarket-apis.ts

@@ -44,6 +44,12 @@ export const POLYMARKET_API_MOCKS = {
       responseCode: 200,
       response: [],
     },
+    // gamma-api: sports league team metadata (TeamsCache)
+    {
+      urlEndpoint: /^https:\/\/gamma-api\.polymarket\.com\/teams(\?.*)?$/,
+      responseCode: 200,
+      response: [],
+    },
     // polymarket.com: homepage carousel
     {
       urlEndpoint: 'https://polymarket.com/api/homepage/carousel',

tests/api-mocking/mock-responses/polymarket/polymarket-mocks.ts

@@ -675,6 +675,25 @@ export const POLYMARKET_PRICES_HISTORY_MOCKS = async (mockServer: Mockttp) => {
     });
 };
 
+/**
+ * Mock for Polymarket gamma-api /teams API
+ * Returns an empty teams array — sufficient for predict specs that render
+ * sports markets with team metadata. Consumer (TeamsCache) handles a
+ * non-array response by short-circuiting, so [] is safe.
+ */
+export const POLYMARKET_TEAMS_MOCKS = async (mockServer: Mockttp) => {
+  await mockServer
+    .forGet('/proxy')
+    .matching((request) => {
+      const url = new URL(request.url).searchParams.get('url');
+      return Boolean(url?.includes('gamma-api.polymarket.com/teams'));
+    })
+    .asPriority(PRIORITY.BASE)
+    .thenReply(200, JSON.stringify([]), {
+      'content-type': 'application/json',
+    });
+};
+
 /**
  * Mock for Polymarket CLOB order book API
  * Returns order book data for specific token IDs with correct market mapping
@@ -2234,6 +2253,7 @@ export const POLYMARKET_COMPLETE_MOCKS = async (mockServer: Mockttp) => {
   await POLYMARKET_ORDER_BOOK_MOCKS(mockServer);
   await POLYMARKET_PRICES_MOCKS(mockServer); // Mock for CLOB prices API
   await POLYMARKET_PRICES_HISTORY_MOCKS(mockServer); // Mock for CLOB prices-history API (chart series)
+  await POLYMARKET_TEAMS_MOCKS(mockServer); // Mock for gamma-api /teams (sports league team metadata)
   await POLYMARKET_FEE_RATE_MOCKS(mockServer);
   await POLYMARKET_MARKET_FEEDS_MOCKS(mockServer);
   await POLYMARKET_CLOB_AUTH_MOCKS(mockServer);