Rip out the Termux/Android install lane: constraints-termux.txt,
psutil_android extraction, termux-browser tests, the apt install-method
lane in install.sh, termux api detection, and the TUI termux layout.
Zero added termux lines; 255 removed. System prompt and skill-utils
termux branches drop with the platform they served.
Rebuilt from ethie/pm (f8236a2d91, 7ad9f0c7a5, 8446c871b6, 82fb8e09d1)
onto the pm-store stack. 11 hot files hand-merged; test_code_execution
restored to branch-final (termux path assertions removed).
f9656f111a