dsh-whale-companion: Turning privacy-secure session metadata into a desktop whale

# Introduction When developing agents using DSH, session progress is inherently invisible: turn counts, tool invocation counts, and continuous usage records are buried in the Host-side event stream. To add visual feedback to this data, common approaches involve either pushing the state back into the model context or sending the data to a remote service; the former wastes tokens, while the latter incurs privacy costs. `dsh-whale-companion` takes a different path: the plugin only observes the metadata of submitted session events on the Host side, without reading content or connecting to the network, rendering the "Tides, Expeditions, Collections" progress system into a draggable desktop whale. Below is an introduction to its positioning, features, installation method, and implementation boundaries. # What is it? `dsh-whale-companion` is a local application.