HIT L2 - Fix delta var attrs

[vmartinez-cu]

Fixes error in HIT L2 metadata where delta var attributes had reversed values assigned (minus and plus values assigned to the opposite delta attrs)

Closes Issue #2729

[Copilot]

Pull request overview

Fixes HIT L2 CDF metadata in the variable-attributes YAML where DELTA_MINUS_VAR and DELTA_PLUS_VAR were previously assigned to the wrong uncertainty variables, aligning the DELTA links with the intended “minus” vs “plus” total-uncertainty fields (Issue #2729).

Changes:

• Swap DELTA_MINUS_VAR to reference *_total_uncert_minus (instead of *_total_uncert_plus) for HIT L2 intensity variables.
• Swap DELTA_PLUS_VAR to reference *_total_uncert_plus (instead of *_total_uncert_minus) for HIT L2 intensity variables.
• Apply the correction consistently across standard, summed, and macropixel intensity variable blocks.

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[Copilot]

This YAML change fixes a metadata mapping bug, but there doesn’t appear to be a regression test asserting that HIT L2 intensity variables’ DELTA_MINUS_VAR/DELTA_PLUS_VAR attrs point to the expected *_total_uncert_minus/*_total_uncert_plus variables. Consider adding a small unit test (e.g., in imap_processing/tests/hit/test_hit_l2.py) that runs hit_l2 (or add_cdf_attributes) and asserts the corrected DELTA attrs for at least one representative variable (standard, summed, macropixel) to prevent this from silently regressing again.

[vmartinez-cu]

Unit tests don't currently validate CDF attribute values. This could be considered in the future

[sdhoyt]

Nice!