updates

ccu_emulator/README.md

@@ -48,9 +48,26 @@ Optionally add periodic state refresh traffic:
 .\.venv\Scripts\python.exe scripts\ccu_emulator.py --refresh-active --refresh-interval 0.600 --duration 30
 ```
 
+Enable the bench-proven IRIS/M.BLACK LINK closed-loop module:
+
+```powershell
+.\.venv\Scripts\python.exe scripts\ccu_emulator.py --iris-mblack-link --duration 60 --log captures\ccu-iris-mblack-link.txt
+```
+
+When the RCP reports selector `0x0013` as `0x4000` or `0x0000`, this module sends:
+
+```text
+05 00 13 00 00 4C  ; ACK selector 0x0013
+00 00 13 40 00 09  ; mirror active, or 00 00 13 00 00 49 for clear
+```
+
+That matches the bench-proven IRIS/M.BLACK LINK state machine: the RCP reports local intent, the CCU acknowledges the selector, then the CCU mirrors the accepted state back so the next physical press toggles the other way.
+
 ## Layout
 
 - `frames.py`: checksums, built-in frames, and simple host-frame builders.
+- `iris_mblack_link.py`: selector `0x0013` ACK-and-mirror state-machine module.
+- `modules.py`: small protocol-module interface for feature-specific CCU behavior.
 - `policy.py`: decides whether an RCP frame should be ACKed.
 - `refresh.py`: optional periodic state-refresh scheduling.
 - `serial_link.py`: serial read/write plus checksum-resync frame detection.