150 findings fixed: linter autofixes for whitespace style (wsl_v5,
nlreturn, noinlineerr), named returns removed, magic numbers replaced
with named constants, static errNotRegular error, explicit Close/Parse
error handling, unused cobra params renamed to _, and runReport/
runTrees/hashPass split into helpers to satisfy cyclop, gocognit, and
funlen. Behavior verified unchanged against the README smoke test.
