Builds a hands-free guided camera tour for a three.js scene — keyframes as data, a time-parametrised Catmull-Rom (Hermite) path with continuous velocity, one camera-owner flag, the tour driving time of day and a day→night blend, staged creatures crossing the frame, handwritten captions, portrait-phone lens widening, instant hand-back on drag/scroll/tap/Esc, and a seek() hook for screenshots and video capture. Use when adding a tour mode, cinematic flythrough, attract mode, camera path animation, keyframed camera, spline camera or showcase video capture to a WebGL scene.
