v1.6.0

Changed

• JavaScript engine migrated from boa_engine to deno_core (V8) — full ECMAScript compliance, JIT compilation, and the foundation for SPA support (React/Vue/Angular)
• DOM shim architecture redesigned: Rust #[op2] ops for data access + JS bootstrap for object wrappers (replaced 3,650 lines of boa closures with ~970 lines of ops + ~300 lines of JS)
• Event handler and setTimeout errors are now logged to console_output instead of silently swallowed
• serde_v8 used for V8-to-JSON conversion (replaces hand-rolled converter)