If you open your front door to find Grass Valley Mayor Janet Arbuckle knocking, it's because she is running for re-election to the City Council.Arbuckle's interest in the city's economic development played a key role in her decision, which she announced Monday.Arbuckle chairs the Redevelopment Oversight Board, handling the financial and legal obligations of the city's now-defunct Redevelopment Agency.She also serves on a task force for the League of California Cities assessing the next steps in economic development options available to towns that depended on their redevelopment agencies to spruce up tired business districts and upgrade low-income housing."To just stop …