Prompt-Template-Manager — Walking Skeleton Plan

The second federated app for augment-it: a place to author prompt templates with {{column}} placeholders and run them per-row against a record set, producing a derived record set with the LLM's output as a new column. Two new microservices land — prompt-store (template CRUD, JSON-backed, same shape as row-store) and prompt-runner (the only container that calls the Anthropic API). The proof-of-life is the url-enrichment prompt: the pipeline-tracker CSV has no url column, so the first useful prompt is 'given the organisation name, find its URL' — and its output becomes the url column the next prompt needs.