Heap trampoline call stack limit

Date: 2026-04-20 Area: bytecode Pull Request: #356

Call stack depth limit with heap-resident trampoline. Added a configurable call depth limit (--stack-size=N, default 3 500) that throws RangeError when exceeded. The bytecode VM dispatches bytecode-to-bytecode calls iteratively via an explicit frame stack (FFrameStack) on the heap rather than recursing on the Pascal call stack. V8/JSC check the native stack pointer against a guard address and are bounded by the OS thread stack size; this implementation uses a heap-allocated frame array and a counter, which are independent concepts — the depth limit is a runtime safety guard, the trampoline is an implementation detail of call dispatch, and neither is related to JIT compilation. The interpreter mode retains Pascal recursion with the depth check as a guard. bytecode-vm.md. embedding.md § Call Stack Depth Limit.