• Export Prometheus metrics for VRR state, source frame rate, backlight level, Pixel Refresher state, and per-HDMI port link status (#529, #531, #536).
• Read HDMI signal geometry and pixel clock per receiver mapping, and report an HDMI receiver as connected only while holding a signal lock (#533, #535, #538).
• Derive OLED ASBL protection directly from the tpcOff marker alone (#530).
• Add hardware profiles and spec entries for OLED48CXPUB, OLED65CXPUA, and OLED48C5PUA (#532).
• Link testing and CI documentation to GitHub Actions workflows, jobs, and step definitions (#537).