skills

General debugging methodology for complex or intermittent failures in any multi-layer system (pipelines, builds, network, DB, queues, integrations, CI). Use it when the symptom is generic/compressed (exit code, "error 500", timeout), when a theory-based fix doesn't change the behavior, or when there is more than one component between the cause and the symptom.

Reference for the Video.js HTML player's `<video-player>` custom element store API — state signals, actions (play/pause/seek/volume/fullscreen/pip/subtitles), lifecycle methods (attach/detach/destroy), feature presets, and feed unload/reload patterns. Activate whenever writing or debugging Video.js player code that accesses `player.store`.