By Chuck Barney, Bay Area News Group Imagine logging onto Expedia.com and finding a vacation destination that promised you absolute freedom, with no limits. That’s the alluring pitch attached to the futuristic theme park featured in “Westworld,” an epic, mind-bending new sci-fi drama from HBO. For top dollar, adult patrons are whisked to a vast wild-West realm where they interact with eerily lifelike robots that make Disneyland’s audio-animatronic figures look like dime-store mannequins.