fork of prime agent with changes i want but are not upstreamable probqbly (and some fixes)

move config under prime agent (#32) master

* move config under prime agent refs ENG-3630, ENG-3633 * trim docs from config change refs ENG-3630, ENG-3633 * remove nonessential branding changes refs ENG-3630, ENG-3633 * drop optional aliases and comments refs ENG-3630, ENG-3633 * fix prime-agent config paths * fix prime-agent test expectations * test github release version parsing * test prime-agent env constants * fix extension loader package fallback * remove repo-local agent resources * narrow config directory migration * minimize config path diff * fix config path help output * fix tui log config path * fix tui log filenames * fix remaining prime agent config paths