Persist regions of interest so an acquisition's ROI layout can be
recovered from the master (_master.h5 / _process.h5):
- /entry/roi/roi_map: uint16 per-pixel bitmask (bit i == ROI i).
- /entry/roi/<name>: logical definition (type + geometry params, incl.
azimuthal phi sector) plus bit_index tying it to the bitmap plane.
The bitmap rides along in the StartMessage (CBOR, mirroring az_int_map)
and is filled both online (JFJochReceiver::SendStartMessage) and offline
(jfjoch_process). Definitions come from the already-transmitted rois.
Both are dataset-wide metadata, so they are written by the NXmx master
writer (new NXmx::ROI), not the per-image data-file plugin.
Documented the /entry/roi layout in docs/HDF5.md and the master-vs-data
writer convention in CLAUDE.md; added a CBOR roi_map round-trip test.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_f
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