Context-triggered proactive media playback system

A system for proactive media curation, comprising:

• a mobile device including one or more processors, a memory, and at least one sensor configured to provide ambient context data;
• a device-resident vector database stored in the memory, the vector database comprising a history space storing associations between context vectors and preference vectors and a catalog space storing media vectors;
• wherein the one or more processors execute an autonomous headless agent that operates as a background service, the autonomous headless agent configured to:
• register with an operating system of the mobile device to receive broadcasts corresponding to context changes;
• in response to at least one broadcast, transition from an idle state to an active state and receive the at least one broadcast;
• based on the at least one broadcast, obtain the ambient context data and detect a composite event trigger based on the ambient context data, the composite event trigger comprising a conjunction of at least two conditions selected from:
• geofence entry or exit, activity transition, velocity threshold, ambient light band, ambient sound pressure band, Bluetooth connection state, and charging state;
• encode the ambient context data into a context vector;
• perform a first similarity search in the history space using the context vector to retrieve one or more preference vectors;
• compute a target media profile vector from the one or more preference vectors;
• perform a second similarity search in the catalog space using the target media profile vector to identify at least one media vector;
• and
• automatically issue a playback request to an external media service to initiate media playback corresponding to the at least one identified media vector, wherein the playback request comprises one or more media identifiers associated with the at least one identified media vector.