Work Done
Read both main and feat/fk/s3-io versions of the src/histo migration, focusing on the new histo.io seam, physical resolution/rounding, resume semantics, and weakened errors. Ran small pixi-based checks that demonstrated: a partial writer resumes across a changed physical geometry; TIFF Level.mpp(1.5) reports a shape and MPP inconsistent with the returned array; non-square pyramid rounding stamps the x axis with the y downsample; and OME-XML-only calibration is discarded by the TIFF adapter. Also identified removal of panoptic input fingerprints and shard-dependent gland inference windows. Reported exact priorities and source locations to the parent review agent. No histo repository files were edited.
Lessons Learned: Pitfalls
The general histo workstream overview did not contain I/O seam or migration invariants and was not directly useful for this narrow diff review. The branch’s tests emphasize surface parity and happy-path stored levels but omit adversarial resolution requests, changed-job resume, axis-specific rounded pyramid dimensions, and calibration sources other than TIFF resolution tags.
Lessons Learned: Improvements
Document and test a migration contract for resumable artifacts: persisted geometry, layout, inputs, model/config fingerprints, and code version must match before any shard is reused. Add property tests asserting image.read(region).shape agrees with the pinned geometry for arbitrary requested MPPs, and that every pyramid level preserves per-axis physical extent within rounding tolerance. Maintain a format calibration matrix (TIFF tags, OME-XML, SVS, NDPI, NGFF units) at the I/O seam.