function pj --description "fzf package.json script runner with auto-detected package manager"
    # ── Locate nearest package.json (walk up) ──────────────────────────
    set -l dir (pwd)
    set -l pkg ""
    while true
        if test -f "$dir/package.json"
            set pkg "$dir/package.json"
            break
        end
        test "$dir" = / && break
        set dir (path dirname $dir)
    end

    if test -z "$pkg"
        echo "pj: no package.json found in this tree" >&2
        return 1
    end
    set -l root (path dirname $pkg)

    # ── Detect package manager ─────────────────────────────────────────
    # Priority: packageManager field (corepack) → lockfiles (walking up
    # past $root to catch monorepo-root locks) → npm fallback
    set -l pm (jq -r '.packageManager // empty' $pkg | string split '@')[1]

    if test -z "$pm"
        set -l d $root
        while test -z "$pm"
            if test -f "$d/bun.lockb" -o -f "$d/bun.lock"
                set pm bun
            else if test -f "$d/pnpm-lock.yaml"
                set pm pnpm
            else if test -f "$d/yarn.lock"
                set pm yarn
            else if test -f "$d/package-lock.json"
                set pm npm
            end
            test "$d" = / && break
            set d (path dirname $d)
        end
        test -z "$pm" && set pm npm
    end

    # ── Pick a script ──────────────────────────────────────────────────
    set -l script (jq -r '.scripts // {} | keys[]' $pkg | fzf \
        --prompt="$pm run ❯ " \
        --header="$root" \
        --height=40% --layout=reverse --border \
        --preview="jq -r --arg s {} '.scripts[\$s]' $pkg" \
        --preview-window=up:2:wrap)

    test -z "$script" && return 0

    # ── Run (npm needs `--` to forward extra args) ────────────────────
    set -l extra $argv
    if test "$pm" = npm -a (count $extra) -gt 0
        set extra -- $extra
    end

    # Wrap long-running server scripts in openlogs (live log tail for agents).
    # Matches dev/start/serve and namespaced variants like dev:web, start:api.
    set -l wrapper
    if string match -qr '^(dev|start|serve|watch)(:.*)?$' -- $script
        # Resolve the binary: PATH → mise resolution → mise installs glob
        set -l ol (command -s openlogs)
        if test -z "$ol"; and command -sq mise
            set ol (mise which openlogs 2>/dev/null)
        end
        if test -z "$ol"
            set ol ~/.local/share/mise/installs/node/*/bin/openlogs
            set ol $ol[1]
        end

        if test -n "$ol" -a -x "$ol"
            set wrapper $ol
        else
            echo "pj: openlogs not found, running unwrapped" >&2
        end
    end
    if test -n "$wrapper"
        echo "→ $wrapper $pm run $script $argv" >&2
        $wrapper $pm run $script $extra
    else
        echo "→ $pm run $script $argv" >&2
        $pm run $script $extra
    end
end