igdb search + capped http reads: native fulltext, full-page fetch

search_games used `where name ~ "<q>"*`: prefix-only, diacritic- and
word-order-sensitive -- "MARVEL Tōkon" found nothing though IGDB has
it. Switch to IGDB's native `search` clause (relevance-ranked,
diacritic-insensitive).

fetch_url and image downloads read bodies with content.read(n), which
returns only the first buffered chunk (~7 KB): pages collapsed to
their <title>. httpread.read_capped collects chunks up to the byte
cap; image downloads read limit+1 so over-limit files are still
rejected instead of cached truncated (IMG-10).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_spec_url.py

@@ -91,6 +91,46 @@ class TestTextExtraction(unittest.TestCase):
         self.assertNotIn("x{}", text)
 
 
+class TestBodyReadCollectsAllChunks(unittest.IsolatedAsyncioTestCase):
+    async def test_get_reads_past_first_chunk(self):
+        """URL-05 regression: body arrives in many chunks; all are collected up to the cap."""
+        reader = URLReader(lambda: {}, None)
+        chunks = [b"<title>t</title>", b"<p>middle</p>", b"<p>end</p>"]
+
+        class FakeContent:
+            @staticmethod
+            async def iter_chunked(size):
+                for chunk in chunks:
+                    yield chunk
+
+        class FakeResp:
+            status = 200
+            headers = {}
+            url = "http://safe.example.com"
+            content = FakeContent()
+
+            async def __aenter__(self):
+                return self
+
+            async def __aexit__(self, *a):
+                return False
+
+            def raise_for_status(self):
+                pass
+
+        class FakeSession:
+            def get(self, url, allow_redirects=False):
+                return FakeResp()
+
+        with patch("fjerkroa_bot.url_reader.guard_url", return_value=None):
+            _, body = await reader._get(FakeSession(), "http://safe.example.com", 1000)
+        self.assertEqual(body, b"".join(chunks))
+
+        with patch("fjerkroa_bot.url_reader.guard_url", return_value=None):
+            _, body = await reader._get(FakeSession(), "http://safe.example.com", 20)
+        self.assertEqual(body, b"".join(chunks)[:20])
+
+
 class TestFetchSanitizes(unittest.IsolatedAsyncioTestCase):
     async def test_fetch_result_is_sanitized_and_capped(self):
         """URL-05: fetch output is length-capped and @everyone-neutralized."""