Function encodeMACFrameZigbee

Encode MAC frame with hotpath for Zigbee NWK/APS payload 05-3474-23 R23.1, Annex C.2.1 (Zigbee data frame rules)

SPEC COMPLIANCE NOTES:

• ✅ Forces frame version to 2003 as mandated for Zigbee data/command frames
• ✅ Encodes only Zigbee-relevant addressing fields for NWK hot path efficiency
• ⚠️ Caller must enforce payload length not exceeding Zigbee safe payload size DEVICE SCOPE: All logical devices.