samples: expand SuperBomb protocol coverage + recursion-shape probes

[devdanzin]

Two low-effort additions to the hostile-object corpus that widen the surface alternative interpreters (RustPython, PyPy) crash on — the dominant RustPython bug class is a native .unwrap()/panic! on a Python-level callback. Independent of #226 (touches only samples/ + the golden).

SuperBomb (_SUPERBOMB_DUNDERS, 65 → 87 slots)

• reflected binary ops: __rmod__/__rdivmod__/__rpow__/__rtruediv__/__rfloordiv__/__rmatmul__/__rand__/__ror__/__rxor__/__rlshift__/__rrshift__
• in-place ops: __imul__/__isub__/__imod__/__ipow__/__itruediv__/__ifloordiv__/__imatmul__/__iand__/__ior__/__ixor__/__ilshift__/__irshift__
• buffer protocol (PEP 688): __buffer__/__release_buffer__ — a raising __buffer__ detonates native buffer acquisition (memoryview(...), struct/array), an error path C/Rust code often skips.

Each still raises the fusil superbomb via <name> message already covered by the stdout ignore-regex, so no new suppression is needed.

Recursion-shape probes (tricky_objects)

For the unguarded-native-recursion crash class (RustPython #2796):

• a pair of _TrickyRecur objects whose hash/eq/getitem/iter/repr/call each re-enter the same protocol on a partner object (mutual cross-object recursion, harder to short-circuit than self-recursion);
• a deep list[list[...T...]] generic-alias bottomed on a TypeVar so the parameter walk actually recurses (RustPython segfaulted in genericalias::make_parameters_from_slice).

CPython raises RecursionError; construction is cheap (recursion fires only when a protocol is exercised). These are corpus building blocks — simple recursion is guarded by RustPython standalone; the segfaults need fusil's combined object graphs.

Flaky-test fix

test_failing_iterator_raises_during_iteration was ~8% flaky on any tree: FailingIterator draws from the bomb pool (which includes StopIteration), and raise StopIteration in a plain iterator's __next__ ends list() cleanly — no exception escapes, so assertRaises fails. The seeded RNG made the new dunder draws surface it reliably. Fixed by pinning exc=ValueError so the test verifies its intent deterministically.

Testing

Golden regenerated (samples are spliced verbatim into every script). ruff check + ruff format --check clean; full suite (1145 tests) green and stable across repeated runs.

🤖 Generated with Claude Code