/**
 * @fileoverview Detect orphaned `opensip-tools/` subtrees between cwd
 * and the discovered project root. These are fossils from pre-discovery
 * runs where `opensip-tools fit` was invoked from a subdirectory and
 * silently scaffolded a phantom project tree at that subdir.
 *
 * Conservative: only flag directories where `opensip-tools/` contains
 * EXCLUSIVELY `.runtime/` (plus optional dotfiles). Any other entry
 * (a `fit/`, a `sim/`, a `opensip-tools.config.yml` at that level) is
 * treated as legitimate user content and ignored — never warned about.
 *
 * Warn-only: returns paths. Callers print warnings to stderr but never
 * auto-delete. Auto-deletion of anything called `opensip-tools/` would
 * be too dangerous to do without explicit user invocation.
 */
/**
 * Walk every ancestor between `cwd` (inclusive) and `root` (exclusive)
 * and return the list of paths that host a phantom `opensip-tools/`.
 */
export declare function detectPhantomRuntimes(cwd: string, root: string): readonly string[];
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