- Add target_os = "android" to CPU sampler (reads /proc/stat like Linux)
- Parse remote CPU from interleaved TCP status messages in BOTH mode
- Add dedicated status reader for TX-only mode (reads server's 12-byte
status messages to get remote CPU and enable speed adaptation)
- Add 3 CPU integration tests: local CPU, TCP BOTH remote, TCP TX-only
Fixes: Android always showing cpu: 0%/0%, TCP remote CPU always 0%
on all platforms (btest-to-btest and btest-to-MikroTik).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>