JavaScript: Fix stack overflow in Type.signature for cyclic parameterized types

[knutwannheden]

Summary

• The Parameterized case in Type.signature() was missing a has() cycle detection check before recursing into type parameters. The Union and Intersection cases already had this guard, but Parameterized did not.
• When shell-cached parameterized types formed cycles (e.g. A<B<A>>), the function recursed infinitely, causing RangeError: Maximum call stack size exceeded during RPC serialization.
• Discovered while building google/zx in a Moderne run.

Test plan

• Added unit tests for cyclic and non-cyclic parameterized type signatures
• Verified locally that parsing google/zx no longer causes stack overflow
• CI passes