Add output camera framing

shared/renderValidation.cjs

@@ -71,6 +71,39 @@ function validateRenderRequest(scene, options = {}, limits = DEFAULT_LIMITS) {
       }
     }
   }
+  if (scene.camera != null) {
+    const camera = scene.camera
+    if (typeof camera !== 'object') return { ok: false, error: 'camera must be an object' }
+    if (camera.enabled) {
+      const cw = Number(camera.base?.width)
+      const ch = Number(camera.base?.height)
+      if (!Number.isFinite(cw) || cw <= 0 || !Number.isFinite(ch) || ch <= 0) {
+        return { ok: false, error: 'enabled camera must have positive width and height' }
+      }
+    }
+    if (camera.keyframes != null) {
+      if (!Array.isArray(camera.keyframes)) {
+        return { ok: false, error: 'camera keyframes must be an array' }
+      }
+      keyframes += camera.keyframes.length
+      if (keyframes > limits.maxKeyframes) {
+        return { ok: false, error: `scene has more than ${limits.maxKeyframes} keyframes` }
+      }
+      for (const kf of camera.keyframes) {
+        if (!Number.isFinite(Number(kf?.time))) {
+          return { ok: false, error: 'keyframe times must be finite numbers' }
+        }
+        const w = kf?.props?.width
+        const h = kf?.props?.height
+        if (w != null && (!Number.isFinite(Number(w)) || Number(w) <= 0)) {
+          return { ok: false, error: 'camera keyframe width must be positive' }
+        }
+        if (h != null && (!Number.isFinite(Number(h)) || Number(h) <= 0)) {
+          return { ok: false, error: 'camera keyframe height must be positive' }
+        }
+      }
+    }
+  }
   const duration = Number(scene.duration)
   if (!Number.isFinite(duration) || duration <= 0 || duration > limits.maxDuration) {
     return { ok: false, error: `duration must be between 0 and ${limits.maxDuration} seconds` }