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Feat: N-12b regions for unbounded virtual objects (#268) - #298
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Pure hosts such as check(make(d)) build the tree in a per-site region of C structs (no PyObject: invisible to gc, tracemalloc, id and other threads) through internal entry points with no Python name; the Python-visible make/check still build real objects. Verifier recomputes region classes/producers/consumers/hosts (forged -> verify/region-escape). Freed on every exit edge; allocation failure deopts so the interpreter raises MemoryError; every region field read keeps the per-access class check (a signal handler installing a property deopts; mutant without it fails). Decisions recorded in SPEC N-12b (known differences: MemoryError threshold, tracemalloc peak). benchmarks/typedpython/py/binary_trees_region.py added; binary_trees.py unchanged; compiled set of existing benchmarks unchanged.
Closes #268