Add an opt-in DUMMY_PSF_SUPPORT_STATS mode to the diagnostic-only dummy
consumer. It records per-chunk cache-limited 16px support references,
touched tiles, 256-reference tasks, maximum tile list and first-pass
counting time, then reports percentiles. No HDR is produced and no
references are materialized or uploaded.
Reuse production catalog mapping and per-worker chunk boundaries to report triangle and spatial distributions without initializing HIP or writing image outputs. Include a protected full-catalog runner and build documentation.