fix: broken defer block causing segfault in walkDirectory

Release v0.5.0: GNU compatibility features

docs: update README with GNU parity status for v0.3.0

ci: pass secrets to shared workflow via inherit

Remove HOMEBREW_TAP_TOKEN secret (now using GitHub App)

v0.3.0: Add dual Formulae support (pure/gnu builds)

chore: bump version to 0.1.1

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

feat: add Brewfile for CI dependencies

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>