Fix CI failures: add hardware import guards and update placeholder URLs

- Add try/except blocks for hardware-specific imports in i2c_controller.py and oled_display.py
- Allows Python syntax checking in CI environments without Raspberry Pi hardware
- Fix placeholder GitHub username in OSC protocol documentation

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: MissCrispenCakes

docs/api/osc-protocol.md

@@ -394,4 +394,4 @@ Planned for future versions:
 
 ## Support
 
-Questions about the OSC protocol? Ask in [GitHub Discussions](https://github.com/yourusername/On-body-haptics/discussions).
+Questions about the OSC protocol? Ask in [GitHub Discussions](https://github.com/MissCrispenCakes/On-body-haptics/discussions).

implementations/raspberry-pi-i2c/firmware/src/lib/i2c_controller.py

@@ -6,14 +6,22 @@
 """
 
 import time
-import board
-import busio
 import threading
 import queue
-import adafruit_drv2605
-import adafruit_tca9548a
 from typing import Dict, Optional
 
+try:
+    import board
+    import busio
+    import adafruit_drv2605
+    import adafruit_tca9548a
+except ImportError:
+    # Hardware modules not available (e.g., in CI environment)
+    board = None
+    busio = None
+    adafruit_drv2605 = None
+    adafruit_tca9548a = None
+
 
 class I2CHapticController(threading.Thread):
     """

implementations/raspberry-pi-i2c/firmware/src/lib/oled_display.py

@@ -5,14 +5,22 @@
 Displays information when button is pressed.
 """
 
-import board
-import digitalio
-import busio
 import threading
 import netifaces
-import adafruit_ssd1306
 from typing import Optional
 
+try:
+    import board
+    import digitalio
+    import busio
+    import adafruit_ssd1306
+except ImportError:
+    # Hardware modules not available (e.g., in CI environment)
+    board = None
+    digitalio = None
+    busio = None
+    adafruit_ssd1306 = None
+
 
 class OLEDDisplay(threading.Thread):
     """