- Fix thread safety: replace #[tokio::main] in codeg_server with manual
runtime construction so set_var runs before any worker threads exist
- Fix nvm alias branch: sort matched candidates (read_dir order is
undefined) and skip non-numeric aliases like lts/* that cannot be
resolved without full nvm evaluation
- Fix HOME missing: accept Option<&Path> for home so env-var-only
discovery (NVM_HOME, VOLTA_HOME, FNM_DIR, etc.) still works in
Docker / systemd environments without HOME set
- Refactor resolve_dir to accept an env var chain, eliminating all
inline Option chains for fnm, nvm-windows, mise, and scoop
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