Method setKnownSubprojects

src/mcp/tools.ts:1431–1434

* Engine-only: record the indexed sub-projects the workspace down-scan saw * when it could not adopt a default project (#1606/#1607). An empty list * clears any previous note.

(roots: string[], base: string)

   * clears any previous note.
   */
  setKnownSubprojects(roots: string[], base: string): void {
    this.knownSubprojects = roots;
    this.knownSubprojectsBase = base;
  }

  /** One message line naming the indexed sub-projects, or '' when none known. */
  private formatKnownSubprojects(): string {