fix: guard recursive array materialization

[He-Pin]

Motivation

The previous materialization guard only tracked Val.Obj. A nested lazy array can re-enter the same Val.Arr during manifestation, especially through the fused ByteRenderer path, and sjsonnet would emit partial JSON until stack/memory failure. Recursive array manifestation should fail before any output grows, matching C++ jsonnet, go-jsonnet, and jrsonnet behavior.

Reproducer:

local a = 1;
local b = local a = 2; local c = local a = 3; [a, c]; [a, b];
[a, b]

Implementation	Behavior
C++ jsonnet 0.22.0	exits 1, RUNTIME ERROR: max stack frames exceeded.
go-jsonnet 0.22.0	exits 1, RUNTIME ERROR: max stack frames exceeded.
jrsonnet 0.5.0-pre99	exits 1, stack overflow
sjsonnet master	exits 1 but writes 3.8MB partial JSON first
this PR	exits 1, stdout 0 bytes, sjsonnet.Error: Stackoverflow while materializing

Modification

• Replace the object-only visitedObjects: IdentityHashMap[Val.Obj, Boolean] with visitedContainers: IdentityHashMap[Val, Boolean].
• Guard ordinary arrays in recursive Materializer, stackless frame push/pop paths, and direct ByteRenderer materialization.
• Keep RangeArr and ByteArr fast paths outside the guard — they are compact numeric leaf arrays, avoiding extra map traffic on hot paths.
• Hoist sub visitor outside the while loop in ByteArr stackless fast path to avoid repeated subVisitor access and asInstanceOf cast per element.
• Use try/finally cleanup on all three materialization paths to avoid retaining containers after errors.
• Add golden tests for nested lazy array cycles and shared acyclic arrays.

Result

• Cyclic arrays fail before partial output, matching reference implementations.
• Shared acyclic arrays materialize normally (not treated as cycles).
• Performance stays flat: upstream mean 261.5ms vs branch mean 261.8ms on array_copy_views.jsonnet.
• Zero additional allocation on hot RangeArr/ByteArr fast paths.

References

• C++ jsonnet core/vm.cpp checks max stack frames in newCall
• Existing test: test_suite/error.array_recursive_manifest.jsonnet