Speed-optimized solution to the challenge: identify Gaia DR3 sources whose BP or RP flux changed by more than 100% over the observation period and write the result CSV. Optimized for shortest execution time via parallel parsing, ≈1.3 seconds (see the sibling repo gaia-codegolf for the minimal-code variant).

Minimal-code solution to the challenge: identify Gaia DR3 sources whose BP or RP flux changed by more than 100% over the observation period and write the result CSV. Optimized for fewest lines of code (see the sibling repo gaia-benchmark for the speed-optimized, parallel variant).