- Switch to bash with strict mode; stop on the first failure and show the
tail of the log
- Log all output to a timestamped file; -v streams it, -q hides steps
- Add -r/-j/-l/-c options and --no-<feature> toggles; versions overridable
via environment
- Fix kTLS kernel check, USE_ZSTD toggle, curl ignoring HTTP errors, and
&>/dev/null backgrounding commands under dash
- Document options in README