[ATLURI0001]

Summary of Changes

• FIRMS CSV Coordinate & Calendar Validation (src/data/firmsCsv.js):
  • Guarded parseFirmsCsv() against blank latitude/longitude cells (which previously coerced Number("") to 0, injecting phantom fire detections at (0, 0)) and enforced WGS84 range bounds (lat in [-90, 90], lon in [-180, 180]).
  • Added strict UTC calendar round-trip verification in acquisitionMsUtc() so impossible dates such as 2026-02-30, 2026-04-31, or 2026-02-29 return NaN rather than silently rolling over to the following month via Date.UTC.
• Automated Test Coverage (src/data/firmsCsv.test.mjs):
  • Expanded unit tests covering blank coordinate rejection, out-of-range latitude/longitude filtering, and leap/non-leap calendar date rollover validation.