Redesign Signal/Channel naming and fix pin-remap breaking references

Arduino analog Signal ids used to be the pin name itself, so fixing a
wrong pin silently changed the id and orphaned any plot trace, control,
or filter pipeline pointing at it. Analog Signal ids are now positional
(ai0, ai1, ...) and decoupled from the underlying pin, matching how
digital I/O already worked.

More broadly, formalizes a Device -> Signal -> Channel -> Plot naming
model (SignalConfig for physical device channels, Channel for derived/
computed ones) and adds core/reference_registry.py to propagate any
Signal or Channel id rename through plot traces, controls, and filter
pipelines instead of leaving them dangling. Signal ids are now editable
in the Signals tab with the same propagation.

.labui profile schema bumped to v2.0 with a transparent migration for
old files, including remapping old pin-name Signal ids to the new
positional ones. Removed six confirmed-dead files (two legacy device
classes, four superseded top-level ui/ duplicates).

1 files changed, 6 insertions, 6 deletions

diff --git a/api_layers/port_registry.py b/api_layers/port_registry.py
index e3c85fd..4328bb2 100644
--- a/api_layers/port_registry.py
+++ b/api_layers/port_registry.py
@@ -3,10 +3,10 @@ api_layers/port_registry.py
 
 PortRegistry — ensures one ArduinoLayer per physical serial port.
 
-Problem: if both an AnalogInputDevice and a DigitalIODevice are
-configured for the same Arduino (/dev/ttyUSB0), they would each
-create their own ArduinoLayer and both try to open the same serial
-port → "device reports readiness to read but returned no data".
+Problem: if two ArduinoDevice instances are configured for the same
+physical Arduino (/dev/ttyUSB0), they would each create their own
+ArduinoLayer and both try to open the same serial port → "device
+reports readiness to read but returned no data".
 
 Solution: all devices call PortRegistry.get_layer(port, baud) instead
 of constructing ArduinoLayer directly.  The registry returns an
@@ -14,9 +14,9 @@ existing layer if one is already open on that port, or creates a new
 one.  All reads/writes go through the single shared layer.
 
 The registry also merges analog_pins across devices so the layer
-caches values for all channels on the Arduino.
+caches values for all signals on the Arduino.
 
-Usage (handled automatically by AnalogInputDevice and DigitalIODevice):
+Usage (handled automatically by ArduinoDevice):
 
     from api_layers.port_registry import port_registry
     layer = port_registry.get_layer("/dev/ttyUSB0", 115200, simulate=False)