An incomplete response with incomplete_details.reason=content_filter kept
finish_reason 'content_filter'. The aux consumers (context compressor
truncation guard, micro_compaction, MCP sampling) only reject 'length', so a
filtered partial summary was committed as if it were complete. No aux
consumer reads 'content_filter', so map every provider-incomplete response to
'length' (completed tool calls still stay 'tool_calls').
8314d3bb28