Retain mixed evaluation indexing costs and partial failure evidence

tools/mixed-eval/README.md

@@ -20,7 +20,10 @@ differ. Inference runs must be coordinated with other CPU measurements. Expect
 media indexing to take minutes; its explicit one-hour bound is a safety ceiling,
 not a performance target. Indexing and query errors remain visible. Temporary
 corpora/indexes are cleaned after the owned sessions close. Partial query results
-are retained in the requested output if a later request fails.
+are retained in the requested output if a later request fails. Indexing stage
+stdout/stderr, JSON reports, failures, timeouts and elapsed time are also retained.
+`complete: true` means evaluation finished, never that release quality passed.
+The query rows retain native basic metrics separately from MCP roundtrip time.
 
 Reported metrics are file-level top1, reciprocal rank and recall@5 after file
 identity deduplication. Hard negatives in the first five and no-answer queries