/** Resolve a command the way a shell's `command -v` does, against an explicit
 *  PATH string. A name containing a slash is treated as a path and checked
 *  directly; a bare name is searched across the PATH dirs, first executable
 *  match winning. Returns the absolute (or as-given, for a slash path) command
 *  location, or null when nothing executable matches.
 *
 *  Used at manager boot to log op=plugin-mcp-spawn per PLUGIN.md `mcp: command`
 *  so a runtime-PATH miss (e.g. bare `node` off the launchd PATH on macOS,
 *  Task 1404) is a boot-time event, not a silently-absent tool. */
export declare function resolveOnPath(command: string, pathEnv?: string): string | null;
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