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/httpread.py

@@ -0,0 +1,18 @@
+"""Bounded HTTP body read (leaf module, no intra-package imports).
+
+`response.content.read(n)` returns whatever is buffered, not n bytes,
+so it silently truncates large or chunked bodies (and web feeds/pages
+parse to garbage). This accumulates decompressed chunks up to a hard
+cap instead.
+"""
+
+CHUNK = 65536
+
+
+async def read_capped(response, max_bytes: int) -> bytes:
+    buf = bytearray()
+    async for chunk in response.content.iter_chunked(CHUNK):
+        buf.extend(chunk)
+        if len(buf) > max_bytes:
+            break
+    return bytes(buf[:max_bytes])