=== sweep: first-load transform cost vs module count
     68 modules  babel   218ms [216-295]  swc   202ms [198-205]
    309 modules  babel   429ms [417-430]  swc   273ms [270-273]
    559 modules  babel   600ms [599-609]  swc   350ms [338-359]
   1059 modules  babel   883ms [859-889]  swc   511ms [504-522]
   2059 modules  babel  1476ms [1474-1479]  swc   788ms [785-795]
   3059 modules  babel  2091ms [2085-2111]  swc  1082ms [1050-1091]

=== real package: @mui/icons-material barrel vs direct paths
  barrel  7 modules, 692ms [677-718]
  direct  17 modules, 132ms [131-133]

fit: babel 0.612ms/module (R²=0.998), swc 0.294ms/module (R²=1)
noise band 79ms → SWC clears noise above ~248 modules
Wrote reports/sweep-results.json