Release 0.2.0: device-aware controls, spear, settings, shaders

Show touch controls only on touch platforms and keyboard hints only on
desktop, via a shared Controls.use_touch_ui() gate (is_touchscreen_available
is unreliable with emulate_touch_from_mouse). Bumps version to 0.2.0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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