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>

fjerkroa_bot/images.py

@@ -14,6 +14,7 @@ from typing import Any, Callable, Dict, List, Optional
 
 import aiohttp
 
+from .httpread import read_capped
 from .persistence import PersistentStore
 
 DEFAULT_CACHE_MB = 500
@@ -79,7 +80,9 @@ class ImageCache:
         async with aiohttp.ClientSession(timeout=timeout) as session:
             async with session.get(url) as response:
                 response.raise_for_status()
-                return await response.content.read(limit + 1)
+                # limit + 1: an over-limit body must stay over-limit so
+                # ingest_bytes rejects it instead of caching it truncated
+                return await read_capped(response, limit + 1)
 
     def data_url(self, sha256: str, ext: str) -> Optional[str]:
         path = self._path(sha256, ext)