docs: the E-1608 source kind, its probe readings and its unverified commands

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/claude/build-and-run.md

@@ -115,6 +115,26 @@ and also exports `LIBGL_ALWAYS_SOFTWARE=1`: the plot is a `GtkGLArea`, so a disp
 usable GPU fails twice, and this is the pair `tools/make-help-shots.sh` already sets. Nothing
 is exported when the option is absent, so GTK's own choice stands.
 
+`--source e1608` selects the MCC E-1608 Ethernet DAQ; its settings are `--source-opt` keys, all optional
+(`address` or `mac`+`subnet`, `port` 54211, `code` 0, `timeout_ms` 2000, `scan_rate` 1000 per channel,
+`ext_clock`, `trigger` `none|rising|falling|high|low`, `auto_restart` 1, `calibrate` 1, `poll_rate` 10,
+`mode` `se|diff`, `ai0`..`ai7` `BIP10V|BIP5V|BIP2V|BIP1V` (an absent key = off, **and any `aiN` key at all
+drops the default**: only a run with no `aiN` key gets `ai0=BIP10V`, so `ai1=BIP5V` alone is channel 1
+alone, and a value that is not a range name is a channel that is off), `dir0`..`dir7` `i|o`,
+`plot0`..`plot7`, `plot_counter`, `do_init`, `ao0_init`, `ao1_init`). Either `address` or `mac` is
+required; a MAC with no `address` is looked up by broadcast, or by a sweep of `subnet` (`a.b.c`).
+The enabled channels times `scan_rate` must not exceed 250 kS/s. `tools/mock_e1608.py` is a protocol
+mock of the board for development (UDP discovery and handshake, TCP commands, a scan stream with a sine
+per channel, calibration memory, `--port`, `--mac`, `--log FILE`, `--drop-after S` and `--overrun-after S`
+switches, `--code N`); there is no real board in the loop, and the mock's header lists the items whose
+layout is unverified. Errors are written to stderr as `[e1608] ...`, once per distinct message.
+
+```sh
+python3 tools/mock_e1608.py --port 54711 &
+./build/udpscope --source e1608 --source-opt address=127.0.0.1 --source-opt port=54711 \
+  --source-opt ai0=BIP10V --source-opt ai1=BIP5V --source-opt plot0=1
+```
+
 `tools/mock_udpstreamer.py` has waveform-injection options used by the probes:
 
 - `--square-harmonics N` shapes `square`: `N` odd harmonics of the ideal step's Fourier