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chore(test): pin draft prototype-inspection behavior restored by #1271 (#1272)

Drafts must stay safe for ecosystem introspection idioms: lodash's
isPrototype (used by isEmpty/isEqual/isPlainObject) reads
value.constructor.prototype, and fast-deep-equal compares constructor
identity. The guard reverted in #1271 broke these (#1265, #1266, #1268)
while its tests still passed, because try/catch made a crash and a
successful block indistinguishable.

These tests assert observable behavior directly, so they fail on
11.1.9-11.1.11 (verified: constructor.prototype throws, constructor
identity and 'in' checks break, writes to own keys named prototype are
dropped) and pass on main. setPrototypeOf remains forbidden; the
applyPatches-layer pollution guards in patch.js are untouched.

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