Widen numeric tolerance for cross-platform reproducibility

DESeq2 produces slightly different floating point results on macOS vs
Linux CI runners. Bump relative tolerance from 2e-5 to 5e-4 (0.05%)
to accommodate platform-specific numeric drift while still catching
real regressions.

Author: Ekin-Kahraman

dev/compare_tables.R

@@ -7,7 +7,7 @@ if (length(args) != 2) {
 
 reference_dir <- args[[1]]
 generated_dir <- args[[2]]
-relative_tolerance <- 2e-5
+relative_tolerance <- 5e-4  # 0.05% — allows cross-platform floating point drift in DESeq2
 zero_tolerance <- 1e-12
 effect_size_absolute_tolerance <- 1e-6