Expand find_node_bin_dir to support 9 version managers / installation
methods across macOS, Linux, and Windows:
- nvm (Unix): fix alias duplicate candidates, skip symbolic aliases
like lts/* that cannot be resolved without full nvm evaluation
- nvm-windows: detect via %NVM_SYMLINK% and %NVM_HOME% with correct
directory layout (node.exe directly in version dir, no bin/)
- fnm: use platform-correct defaults (%APPDATA%/fnm on Windows,
$XDG_DATA_HOME/fnm on Unix) instead of hardcoded Unix path
- volta: validate that a concrete Node image exists before adding
the shim directory, preventing cryptic errors when volta is
installed but no Node version has been set
- asdf (Unix): $ASDF_DATA_DIR or ~/.asdf/installs/nodejs/
- mise/rtx (cross-platform): $MISE_DATA_DIR with XDG fallback
- n (Unix): $N_PREFIX or /usr/local/n/versions/node/
- Homebrew (macOS): /opt/homebrew and /usr/local prefixes
- Scoop (Windows): nodejs-lts and nodejs app detection
Also improve production readiness:
- Document thread-safety requirements for set_var (unsafe in ed. 2024)
- Add warning log when HOME is unset (Docker / minimal containers)
- Clarify FNM_MULTISHELL_PATH scope (server binary only, not GUI)
- Note lexicographic sort limitation for semver edge cases
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