Adds a post-build obfuscation step using javascript-obfuscator with
hidden vite sourcemaps chained back to TypeScript via @ampproject/remapping,
so production packages ship mangled code while debug-time maps still
resolve to original sources. Wires obfuscation into all package:* scripts
via a new build:obf step.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
