Add configurable OME-Zarr store format via bids_oz_out/bids_oz_in wrappers

[Copilot]

Intermediate OME-Zarr stores are hardcoded as directories (ome.zarr), with no way to switch to single-file formats. This adds a --zarr-store-ext flag and wrapper functions that abstract the format choice away from individual rules.

New CLI arg

--zarr-store-ext {ome.zarr,ozx} (default: ozx) — controls the on-disk format for all intermediate zarr stores.

New wrapper functions (common.smk)

• bids_oz_out(**kwargs) — use in output: blocks; substitutes {ext} in suffix=, wraps with directory() only when ome.zarr is selected
• bids_oz_in(**kwargs) — use in input: blocks; same substitution, no directory() wrapping

# Before
output:
    corrected=temp(
        directory(bids(root=work, ..., suffix="SPIM.ome.zarr", ...)),
        group_jobs=True,
    )
input:
    corrected=bids(root=work, ..., suffix="SPIM.ome.zarr", ...)

# After
output:
    corrected=temp(
        bids_oz_out(root=work, ..., suffix="SPIM.{ext}", ...),
        group_jobs=True,
    )
input:
    corrected=bids_oz_in(root=work, ..., suffix="SPIM.{ext}", ...)

Updated rules

All OME-Zarr output/input paths replaced across: segmentation.smk, vessels.smk, regionprops.smk, patches.smk, qc.smk, fieldfrac.smk, templatereg.smk.