[codex] Address epoch gaincal test review

[jakobtfaber]

Summary

• replaces exact RA float equality in the PR Thread _extract_field_ra_dec through calibration PHASE_DIR reads #14 epoch gaincal shape test with np.testing.assert_allclose
• computes the expected RA explicitly before assertion
• lets ruff format normalize the touched test file

Review context

Addresses the unresolved Copilot review thread from PR #14 on tests/test_epoch_gaincal_field_shape.py. The modulo was already applied after converting to degrees in the merged code, but the exact equality feedback was valid and the rewrite makes the expectation clearer.

Validation

• PYTHONPATH=/workspace python3 -m pytest tests/test_epoch_gaincal_field_shape.py -q
• ruff check tests/test_epoch_gaincal_field_shape.py
• ruff format --check tests/test_epoch_gaincal_field_shape.py
• git diff --check -- tests/test_epoch_gaincal_field_shape.py

[Copilot]

Pull request overview

Updates the epoch gaincal FIELD-shape regression tests to be numerically robust and clearer about the expected RA computation, addressing prior review feedback from PR #14.

Changes:

• Replace exact RA float equality with np.testing.assert_allclose.
• Compute expected_ra explicitly before asserting, improving readability.
• Apply ruff format-normalized formatting to the touched test arrays/expressions.

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