Document accepted chunk map export

docs/operations.md

@@ -37,6 +37,12 @@ automatically removes output. The
 [JSON output contract](integrations/json-output.md) owns the logical file
 names, schemas, and media types inside a run directory.
 
+An enabled JSON `include_chunk_map` option adds an accepted chunk map to durable
+output. Its annotations may contain source- or model-derived data, so retain
+and protect it like lane output. The map is opt-in and does not alter existing
+bundles; its payload exclusions are defined in the
+[Accepted Chunk Map contract](integrations/chunk-map.md).
+
 Remove an output run directory only after its consumer data is no longer
 needed. This is data deletion, not cache cleanup.