~anthropic/claude-sonnet-latest → B (6:4)

Side B fixes a real correctness bug (silently defaulting to 0 instead of failing when an ingested post can't be found, and inconsistent 1-vs-0 indexing across garden.rs, rpc.rs, and types docs), consistently updates all affected call sites, and adds integration tests asserting correct index values. Side A only adds a new CLI display helper for existing stats with unit tests, which is useful but a smaller, purely additive feature rather than a fix to an existing defect.