[Rust][Game] Wrap game ownership with RAII

[utilForever]

Parent: #137

Goal

Provide a safe Game type that creates, loads, resets, seeds, and destroys the opaque native handle.

Scope

• Make Drop release the handle exactly once
• Prevent safe use after move or destruction
• Represent setup failures as Result

Non-goals

• Shared ownership without a use case
• Exposing raw handles in normal APIs
• Global mutable game state

Acceptance criteria

• Safe callers never invoke destroy manually.
• Move and early-error paths do not leak or double free.
• Multiple Game values remain independent.

Verification

Run lifecycle, failed-construction, move, and multiple-game tests under available memory diagnostics.