fix(sensor): dynamic discovery for WHO 1 light/motion sensors and ghost light prevention (#244)

[GreenGrassBlueOcean]

Summary

Fixes #244.
Follow-up to feedback from @anotherjulien on #232 (comment).

Legrand 048834 / WHO 1 motion & illuminance sensors broadcast under WHO=1 (Lighting). Previously, frames from these devices were treated as lighting telegrams, causing them to be discovered as ghost light entities sharing the same A/PL address. Furthermore, motion frames (WHAT = 34) and illuminance dimension messages (DIMENSION = 6) were not properly interpreted.

Changes Made

1. OWNLightingEvent Classification (ownd/message.py):

   • Added is_sensor property identifying motion (WHAT=34), illuminance (DIMENSION=6), sensitivity (DIMENSION=5), and timeout (DIMENSION=7) frames.
   • Updated is_on to ensure sensor messages (WHAT=34) do not evaluate as light ON.
   • Maintained strict _NONCE pattern (\d{5,}) to avoid colliding with *#5## and *#9##.

2. Light Entity Filtering & Registry Purge (light.py):

   • Track known WHO 1 sensor addresses across configured entities, restored entity registry entries, and incoming sensor runtime telegrams.
   • Automatically unregister and suppress ghost light entities when WHO 1 sensor activity is detected on their address.

3. Motion Sensor Discovery & Routing (binary_sensor.py):

   • Automatically discovers MyHOMEMotionSensor for WHO 1 on *1*34*WHERE##.
   • Restores WHO 1 motion sensors from the entity registry on startup.
   • Safely dispatches motion events without race conditions or entity unmount exceptions.

4. Illuminance Sensor Integration (sensor.py):

   • Integrated MyHOMEIlluminanceSensor into the Phase 1 sensor architecture.
   • Restores illuminance sensors from the entity registry on startup.
   • Discovers new illuminance sensors dynamically upon receiving illuminance dimension frames (*#1*WHERE*6*LUX##).

5. Test Coverage:

   • Achieved 100% statement and branch coverage across all modified files and the entire codebase (6,368 / 6,368 statements covered, 800 tests passing).

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