Nest the acquisition notification inside AnalogInputStreamCapability

Problem: DAQNotification (willAcquire/didAcquire) sat as a free-floating
module-level enum in capabilities.py, unattached to the capability that
posts it.

Solution: Nest it as AnalogInputStreamCapability.Notification, inside the
acquisition capability it belongs to, so the notification is discoverable
from the capability that raises it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: dccote

CHANGELOG.md

@@ -52,7 +52,8 @@ API changes can land even when the minor version is unchanged.
   `hardwarelibrary/capabilities.py`, and share one `Capability` base class (the
   per-family `sources/capabilities.py`, `powermeters/capabilities.py`, and
   `daq/daqdevice.py` are removed; the DAQ enums `InputSource`, `TriggerSource`,
-  `SampleClock`, `DAQNotification` move there too). Imports must point at
+  `SampleClock` move there too, and the acquisition notification enum is now
+  nested as `AnalogInputStreamCapability.Notification`). Imports must point at
   `hardwarelibrary.capabilities` (the family package `__init__`s still re-export
   their own mixins, so `from hardwarelibrary.daq import AnalogIOCapability` and
   the like keep working). `capabilities()` / `hasCapability()` are hoisted onto

hardwarelibrary/capabilities.py

@@ -288,11 +288,6 @@ def doGetAvailableScales(self) -> list:
 # DAQ capabilities
 # ---------------------------------------------------------------------------
 
-class DAQNotification(Enum):
-    willAcquire    = "willAcquire"
-    didAcquire     = "didAcquire"
-
-
 class AnalogInputCapability(Capability):
     """Analog input capability (ADC). Combine with PhysicalDevice in a driver."""
 
@@ -351,6 +346,10 @@ class AnalogInputStreamCapability(AnalogInputCapability):
             device.stopStream()
     """
 
+    class Notification(Enum):
+        willAcquire = "willAcquire"
+        didAcquire  = "didAcquire"
+
     @abstractmethod
     def configureStream(self, channels, sampleRate):
         """Set up a hardware-timed acquisition of channels at sampleRate (Hz)."""