Added astro-mermaid integration for client-side rendering. Converted: composition diagram (flowchart), IbusHandler state machine (stateDiagram-v2), and OBD-II protocol timeline. Circuit schematic stays ASCII — Mermaid can't do pin-level schematics.
Added astro-mermaid integration for client-side rendering. Converted: composition diagram (flowchart), IbusHandler state machine (stateDiagram-v2), and OBD-II protocol timeline. Circuit schematic stays ASCII — Mermaid can't do pin-level schematics.