Implement Console API: console.log, console.error, console.warn #278

Implements issue 3mhyflupav42i — Console API (Phase 11, issue 1 of 8).

Summary #

• Adds ConsoleOutput trait with configurable output sink (default writes to stdout/stderr)
• Registers console as a global object with methods: log, info, debug, error, warn
• Rich formatting for console output: arrays show [ 1, 2, 3 ], objects show { key: value }, with cycle detection and depth limiting
• Vm::set_console_output() allows redirecting output for dev tools or testing
• 14 new tests covering all methods, formatting, channel routing, and edge cases

Test plan #

• cargo fmt --all --check passes
• cargo clippy --workspace -- -D warnings passes
• cargo test --workspace — all existing tests pass (no regressions)
• 14 new console-specific tests pass (string output, multiple args, error/warn channels, aliases, array/object formatting, typeof checks)