prepare() runs once mode and app key are known, before engine, surfaces
and SteamVR; returning false ends exec() with exit code 1 (D21). The base
constructor takes the app's own QCommandLineOptions, parses them with its
own and exposes them via isOptionSet()/optionValue() (D38).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Template stripped to the overlay platform (examples, demo UI and Frame
test package removed), renamed to FrameAssistant, and working rules for
the project recorded in CLAUDE.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>