Add comprehensive test coverage for non-omitted modules

[Copilot]

Adds comprehensive test coverage for all modules not excluded from coverage checks (grid.py, siteamp_models.py, timeseries.py, xyts.py, geo.py).

Changes

• grid.py: Test ValueError when coordinate_patchgrid() called without resolution or nx/ny
• siteamp_models.py: Test 5 validation errors in cb_amp_multi():
  • Empty DataFrame
  • Missing required columns
  • NaN, infinite, and non-positive values
• timeseries.py: Test error conditions:
  • ZeroDivisionError in ampdeamp() with zero amplification factor
  • ValueError for invalid LFSeis file format in parser constructor
  • ValueError when no seis files found in directory
• xyts.py: Test error conditions:
  • ValueError for invalid XYTS file format
  • AttributeError when calling tslice_get() or pgv() on meta-only instances
• geo.py: Comprehensive test coverage with 13 new test cases:
  • Distance calculations (get_distances, closest_location)
  • Coordinate transformations (gen_mat, xy2ll, ll2xy, gp2xy)
  • Mathematical utilities (rotation_matrix, angle_diff edge cases)
  • Path generation (path_from_corners)
  • Great circle calculations (ll_cross_along_track_dist)

Coverage Impact

• grid.py: 100% (all raise statements covered)
• siteamp_models.py: 89% (all targeted raises covered)
• timeseries.py: 99% (all targeted raises covered)
• xyts.py: 97% (all targeted raises covered)
• geo.py: 100% (improved from 49% to 100%)

All 25 new test cases pass with no security issues detected.

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[lispandfound]

@copilot try adding extra test cases in the geo module.

[Copilot]

@copilot try adding extra test cases in the geo module.

Added comprehensive test coverage for the geo module, improving coverage from 49% to 100%. The changes include 13 new test cases covering:

• get_distances() - single and multiple reference points
• closest_location() - finding nearest location
• gen_mat() - transformation matrix generation
• xy2ll() and ll2xy() - coordinate conversion roundtrip
• gp2xy() - grid point to XY conversion
• rotation_matrix() - 2D rotation matrix
• path_from_corners() - path generation with return and file output
• ll_cross_along_track_dist() - cross-track and along-track distance calculations
• angle_diff() - additional edge cases for angle differences

All 46 tests in test_geo.py now pass. See commit a68c3ff.