webcam copy

docs/pt2-copy-state-machine.md

@@ -124,15 +124,25 @@ Family-00 comparison run on 2026-05-27:
   -> 02 00 04 responses after 006C
 ```
 
-This suggests the family-00 forms update/read back selector values but should not
-be treated as equivalent to the command-5 COPY side-effect selectors unless an
-LCD observation proves otherwise.
+Webcam-confirmed LCD results from the same 2026-05-27 run:
+
+```text
+00 00 6D 00 00 37 -> COPY IN PROGRESS
+00 00 6C 00 00 36 -> COPY COMPLETED
+05 00 6D 00 00 32 -> COPY IN PROGRESS
+05 00 6C 00 00 33 -> COPY COMPLETED
+```
+
+The 250 ms and 1000 ms gap variants both produced the same LCD sequence. This
+means the family-00 selector/write form can reach the COPY LCD side effects, even
+though its serial response rhythm is the table-readback rhythm rather than the
+command-5 `01 00 02` / `02 00 04` rhythm.
 
 Current interpretation:
 
 - `0x006D` is a copy-start/progress-window refresh selector.
 - `0x006C` is a completion/exit selector that only behaves cleanly while the copy window is live.
-- The observed `00 00 6C 00 00 36` frame is copy-related, but should not be read as "COPY COMPLETED" by itself.
+- The observed `00 00 6C 00 00 36` frame can display `COPY COMPLETED` when it is sent inside a live copy window, but should not be read as a stateless "show completed" command.
 - The copy window is transient and timer-controlled.
 - The panel does not treat `0x006C` as a stateless "show completed" command.
 

docs/pt2-protocol.md

@@ -646,6 +646,25 @@ The gated scenario first seeds candidate secondary-table feature bits with comma
 
 Then it streams `E000[0x008F]=0x1800` and `E000[0x0093]=0x90FF`. This is the better next watch if quiet/broad E000-only refreshes do not produce local-control TX.
 
+## Bench Webcam Capture
+
+For tests where LCD timing/state matters, `serial_scenario.py` can take webcam
+snapshots tied to exact TX commands. Current bench calibration:
+
+```powershell
+--camera-index 4 --snapshot-delays 0.5
+```
+
+Camera index `4` is the working panel-facing webcam on the current PC. A single
+`0.5` second post-TX delay captures readable LCD changes without creating the
+large image sets produced by `0,0.25,1.0`.
+
+Example:
+
+```powershell
+.\.venv\Scripts\python.exe scripts\serial_scenario.py scenarios\copy-step-006d-006c-1000ms.json --parity E --quiet-console --log captures\copy-webcam.txt --result-json captures\copy-webcam-result.json --snapshot-dir captures\copy-webcam-shots --camera-index 4 --snapshot-delays 0.5
+```
+
 After a run, summarize unexpected device frames with:
 
 ```powershell