Builds the sanitized environment variable map for a spawned local render worker child process.
Pure function: copies only ALLOWED_WORKER_PARENT_ENV_KEYS from parentEnv and sets
VIDEO_STUDIO_RENDER_HOST=127.0.0.1, VIDEO_STUDIO_RENDER_PORT=0, and
VIDEO_STUDIO_RENDER_TOKEN=<token>.
Builds the sanitized environment variable map for a spawned local render worker child process.
Pure function: copies only
ALLOWED_WORKER_PARENT_ENV_KEYSfromparentEnvand setsVIDEO_STUDIO_RENDER_HOST=127.0.0.1,VIDEO_STUDIO_RENDER_PORT=0, andVIDEO_STUDIO_RENDER_TOKEN=<token>.