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classes, four superseded top-level ui/ duplicates).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, 10 insertions, 10 deletions

diff --git a/ui/windows/devices_window.py b/ui/windows/devices_window.py
index ae88c6b..5d47681 100644
--- a/ui/windows/devices_window.py
+++ b/ui/windows/devices_window.py
@@ -5,7 +5,7 @@ DEVICES window — toolbar section 2.
 
 Tabs:
   Physical Devices  — add / remove / connect devices; shows status cards
-  Channels          — per-device channel list: rename, set unit, enable/disable
+  Signals           — per-device signal list: rename, set unit, enable/disable
 """
 
 from PyQt6.QtWidgets import (
@@ -84,7 +84,7 @@ class DeviceRow(QFrame):
         self._status_lbl = QLabel(_STATUS_TEXT.get(self.device.status, "?"))
         self._status_lbl.setObjectName("deviceSub")
         self._set_status_style()
-        n = sum(1 for c in self.device.info.channels if c.enabled)
+        n = sum(1 for c in self.device.info.signals if c.enabled)
         ch_lbl = QLabel(f"{n} ch")
         ch_lbl.setObjectName("deviceChannelCount")
         stat_col.addWidget(self._status_lbl)
@@ -129,7 +129,7 @@ class DeviceRow(QFrame):
         )
 
 
-class ChannelsTab(QWidget):
+class SignalsTab(QWidget):
     """Shows all channels across all devices in an editable table."""
 
     channel_visibility_changed = pyqtSignal(str, str, bool)   # dev_id, ch_id, enabled
@@ -174,12 +174,12 @@ class ChannelsTab(QWidget):
         self._table.setRowCount(0)
         row = 0
         for dev in self.registry.all_instances():
-            for ch in dev.info.channels:
+            for ch in dev.info.signals:
                 self._table.insertRow(row)
 
                 # Device + signal ID folded into one non-editable column —
                 # the separate "Signal ID" column was removed as redundant.
-                dev_item = QTableWidgetItem(f"{dev.info.icon} {dev.info.device_id} / {ch.channel_id}")
+                dev_item = QTableWidgetItem(f"{dev.info.icon} {dev.info.device_id} / {ch.signal_id}")
                 dev_item.setFlags(dev_item.flags() & ~Qt.ItemFlag.ItemIsEditable)
                 dev_item.setForeground(QColor("#64748b"))
                 self._table.setItem(row, self._C_DEVICE, dev_item)
@@ -192,7 +192,7 @@ class ChannelsTab(QWidget):
                 chk = QCheckBox()
                 chk.setChecked(ch.enabled)
                 dev_id_cap = dev.info.device_id
-                ch_id_cap  = ch.channel_id
+                ch_id_cap  = ch.signal_id
                 chk.toggled.connect(
                     lambda checked, d=dev_id_cap, c=ch_id_cap: self._on_enabled(d, c, checked)
                 )
@@ -200,7 +200,7 @@ class ChannelsTab(QWidget):
                 self._table.setCellWidget(row, self._C_ENABLED, chk_container)
 
                 name_item = QTableWidgetItem(ch.name)
-                name_item.setData(Qt.ItemDataRole.UserRole, (dev.info.device_id, ch.channel_id))
+                name_item.setData(Qt.ItemDataRole.UserRole, (dev.info.device_id, ch.signal_id))
                 self._table.setItem(row, self._C_NAME, name_item)
 
                 unit_item = QTableWidgetItem(ch.unit)
@@ -218,7 +218,7 @@ class ChannelsTab(QWidget):
     def _on_enabled(self, dev_id: str, ch_id: str, checked: bool):
         dev = self.registry.get_instance(dev_id)
         if dev:
-            ch = dev.get_channel(ch_id)
+            ch = dev.get_signal(ch_id)
             if ch:
                 ch.enabled = checked
                 self.channel_visibility_changed.emit(dev_id, ch_id, checked)
@@ -234,7 +234,7 @@ class ChannelsTab(QWidget):
         dev = self.registry.get_instance(dev_id)
         if not dev:
             return
-        ch = dev.get_channel(ch_id)
+        ch = dev.get_signal(ch_id)
         if not ch:
             return
         if col == self._C_NAME:
@@ -318,7 +318,7 @@ class DevicesWindow(QWidget):
         tabs.addTab(dev_tab, "  Physical Devices  ")
 
         # Tab 2: Channels
-        self._ch_tab = ChannelsTab(self.registry)
+        self._ch_tab = SignalsTab(self.registry)
         self._ch_tab.channel_visibility_changed.connect(self.channel_visibility_changed)
         self._ch_tab.channel_name_changed.connect(self.channel_name_changed)
         self._ch_tab.channel_unit_changed.connect(self.channel_unit_changed)