Maintainer ruling: only Hermes and only its packaged package managers
(uv/pip/node/npm) are ever used; no PATH fallback when the managed tool is
missing, no "prefer the user's if new enough".
- hermes_constants.find_node_executable: node/npm/npx resolve to PM's
installed copy or None. Every caller already pm.ensure()s on None, so a
missing runtime is now provisioned instead of silently borrowing the
user's Node (native-addon ABI / npm cache mismatches).
- agent/lsp/install._install_npm: pm.ensure('npm') when PM npm is absent,
instead of failing over to whatever npm is on PATH.
- gateway._append_node_dir_for_service: stop baking the invoker's PATH node
dir into generated systemd/launchd units.
- main_install_repair._resolve_node_runtime_npm: drop the PATH re-scan for
another npm.
- source_build.source_product_current: run the freshness reader only with
PM's node.
- doctor: Node/npm rows and npm audit use PM's copies (Termux APT distro
keeps its system Node).
- install.sh ensure_uv / install.ps1 Get-Uv: always stage the pinned uv
artifact; delete the "uv on PATH if new enough" developer shortcut.
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