dsh-aw-viz: Converting ActivityWatch habit data into model-readable metrics

dsh-aw-viz is a third-party read-only panel for the DSH Desktop (Harness 0.2.x), maintained by woshijing1991-cloud. It aggregates raw records from the local ActivityWatch into six sets of metrics with external references—time allocation, fragmentation, focus blocks, hourly rhythms, PC/Phone split, and integrity—and exposes them to the model within the same session via the read-only tool `aw_habit_report`, enabling the assistant to provide suggestions based on real screen usage data. The plugin does not write to disk or connect to the network; requests are restricted to the loopback interface, and the interface displays an empty state when ActivityWatch is not running. It supports `file:` local installation, installation via the plugin marketplace, and manual profile configuration, requiring a DSH restart to take effect.