feat(phone): H.264 decode on iOS — VTDecompressionSession + Metal display

[gHashTag]

Part of #82

What

Add H.264 hardware decode to TriNetVideo iOS app. Currently app ENCODES camera → H.264 → UDP but cannot DECODE received H.264 → display.

Implementation

• VTDecompressionSession in VideoPipeline.swift
• Feed received NAL units (from NetController.onData) → decode → CVPixelBuffer
• Display CVPixelBuffer via MetalKit or CALayer
• SPS/PPS extraction from keyframes for session init

File

• TriNetVideo/VideoPipeline.swift — add H264Decoder class

Gate

Received H.264 frames displayed on phone screen (loopback test).

phi^2 + phi^-2 = 3