fix: correct max_rows error message from "exceeds" to "reached"

When len(rows) == max_rows, the count equals the maximum — it does not
exceed it. The error message now accurately says "reached maximum".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: antoineleclair

src/dqlitewire/messages/responses.py

@@ -402,7 +402,7 @@ def decode_body(
             offset += consumed
 
             if len(rows) >= max_rows:
-                raise DecodeError(f"Row count {len(rows)} exceeds maximum {max_rows}")
+                raise DecodeError(f"Row count {len(rows)} reached maximum {max_rows}")
 
             if offset == prev_offset:
                 raise DecodeError(

tests/test_messages_responses.py

@@ -544,7 +544,7 @@ def test_max_rows_limit_decode_body(self) -> None:
         assert len(decoded.rows) == 5
 
         # Should fail with max_rows=3
-        with pytest.raises(DecodeError, match="Row count.*exceeds maximum"):
+        with pytest.raises(DecodeError, match="Row count.*reached maximum"):
             RowsResponse.decode_body(body, max_rows=3)
 
     def test_max_rows_exact_boundary_rejects_at_limit(self) -> None:
@@ -570,8 +570,9 @@ def build_body(n_rows: int) -> bytes:
             body += encode_uint64(0xFFFFFFFFFFFFFFFF)  # DONE
             return body
 
-        # Exactly max_rows rows should raise
-        with pytest.raises(DecodeError, match="exceeds maximum"):
+        # Exactly max_rows rows should raise — message must say "reached",
+        # not "exceeds", because len(rows) == max_rows (issue 178)
+        with pytest.raises(DecodeError, match="reached maximum"):
             RowsResponse.decode_body(build_body(3), max_rows=3)
 
         # One fewer than max_rows should succeed