Add support for exchange properties sent by the agent alongside headers.
Properties flow through the same pipeline as headers: ClickHouse columns
(input_properties, output_properties) on both executions and
processor_executions tables, MergedExecution record, ChunkAccumulator
extraction, DetailService snapshot, and REST API response.
UI adds a Properties tab next to Headers in the process diagram detail
panel, with the same input/output split table layout.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
0827fd21e3