feat(czi): extract instrument-metadata block (objective + acquisition + channels) into audit + OME-XML — replaces #54

[ferrinm]

What to build

Broader-scope replacement for #54. Populate the full instrument-metadata surface on the CZI reader path so CZI conversions carry the same audit / OME-XML richness as LIF does after #52 + #62.

Scope

Extract all of the following per scene (or per file where the ADR places them) from a CZI file — src/zarrmony/readers/czi.py and the bioio-czi surface it wraps:

1. Objective (originally feat(czi): extract objective lens metadata into audit + OME-XML #54): nominal_magnification, numerical_aperture, immersion, model, working_distance_um. Source: ImageDocument/Metadata/Information/Instrument/Objectives. Populate per_scene[i].objective and the OME-XML <Instrument>/<Objective> + per-image <ObjectiveSettings>.
2. Acquisition + instrument (new from feat(lif): extract per-scene acquisition/instrument block (date, microscope, imaging_method) into audit + inspect #62): acquisition_date, microscope_model, microscope_serial, imaging_method. Source: ImageDocument/Metadata/Information/Image/AcquisitionDateAndTime and .../Instrument/Microscopes. Populate per_scene[i].acquisition (or the ADR-chosen block name).
3. Channels (from feat(audit): store per-scene channel identity (dye/fluor/excitation/emission) across all reader paths #61): project reader.ome_metadata.images[0].pixels.channels into per_scene[i].channels with the ADR-locked shape.

Implementation notes

• Prefer bioio-czi's already-parsed OME metadata where it exposes the field — falls out of ome_types for free (channels, objectives, dates when the reader normalises them).
• When bioio-czi surfaces raw CZI XML but not parsed content, walk the CZI-specific XML directly and normalise field names + immersion enum + imaging-method token to OME conventions.
• Reuse the audit dict shape and OME-XML population helpers from feat(lif): extract objective lens metadata (magnification, NA, immersion) into audit + OME-XML #52 (objective) and feat(lif): extract per-scene acquisition/instrument block (date, microscope, imaging_method) into audit + inspect #62 (acquisition).
• Fail-safe like feat(lif): extract objective lens metadata (magnification, NA, immersion) into audit + OME-XML #52: any extraction failure omits the field/block rather than crashing conversion.
• Inspect() output includes the same blocks per scene.

Acceptance criteria

• per_scene[i].objective, per_scene[i].acquisition, and per_scene[i].channels populated on a representative CZI file (bring your own; note file used in PR description).
• OME-XML sibling contains <Instrument><Objective .../></Instrument> and <ObjectiveSettings ID=.../>.
• Same blocks visible in inspect().scenes[i].
• Missing fields → key omitted; missing block entirely → key absent from scene entry. No dummy values.
• Test with a CZI fixture (add a small one, or vendor from bioio-czi's test data if licensing allows).
• Cross-format consistency check: field names + value types match LIF (feat(lif): extract objective lens metadata (magnification, NA, immersion) into audit + OME-XML #52 + feat(lif): extract per-scene acquisition/instrument block (date, microscope, imaging_method) into audit + inspect #62) exactly.
• CHANGELOG entry under a minor version bump.

Blocked by

• ADR-0007: Aperture BigQuery ↔ zarrmony field-mapping contract + instrument-metadata audit shape #60 (ADR-0007 locks the shape)
• feat(lif): extract per-scene acquisition/instrument block (date, microscope, imaging_method) into audit + inspect #62 (LIF establishes the acquisition/instrument block shape)
• feat(lif): extract objective lens metadata (magnification, NA, immersion) into audit + OME-XML #52 (LIF establishes the objective block + OME-XML injection helpers)

Replaces

• feat(czi): extract objective lens metadata into audit + OME-XML #54 (objective-only slice; closed in favor of this broader-scope reorg per the ingest-team mapping effort)