Drop the USBPort claim workaround in PwrUSBDevice init

Problem: doInitializeDevice reached past the CommunicationPort abstraction to
call usb.util.claim_interface on the USBPort's pyusb device, purely to make a
macOS-claimed HID interface fail fast. With transport defaulting to "auto"
(HID when hidapi is present), the USBPort path is only taken when explicitly
requested on Linux, where the claim succeeds anyway, so the workaround is dead
weight that also broke the port abstraction.

Solution: Remove the isinstance/claim_interface block; open the selected port
uniformly. A missing device still surfaces as OSError/USBError from the port and
is skipped by the hardware tests.

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

Author: dccote

hardwarelibrary/powerstrips/pwrusb.py

@@ -83,17 +83,9 @@ def doInitializeDevice(self):
         try:
             if self.portPath == "debug":
                 self.port = DebugPwrUSBPort()
-                self.port.open()
             else:
                 self.port = self._makePort()
-                self.port.open()
-                if isinstance(self.port, USBPort):
-                    # USBPort.open() swallows I/O errors during its flush, so a
-                    # HID interface the OS will not release (e.g. macOS
-                    # IOHIDFamily) is only discovered on the first real transfer.
-                    # Claim it here so such a device fails to initialize cleanly
-                    # instead of later.
-                    usb.util.claim_interface(self.port.device, 0)
+            self.port.open()
 
             self._outletStateCache = [False] * self.switchableOutletCount
         except Exception: