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N-12 step 2 decision: borrow only virtual objects, gc race test (#143, #193) - #281
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This was referenced Oct 25, 2026
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SPEC N-12: on 3.15t no real object is thread-local (gc.get_objects/get_referrers reach a fresh object), so real field reads keep PyMember_GetOne and only N-12a virtual objects are borrowed. Adds a gc.get_objects race test whose borrowed-read mutant crashes, and virtual/fresh calls to the TSan script. Mutant tests count a hung child as caught (seen under load). The test also exposed #280 (chunked loops poll too rarely), so it uses a TP_POLL_INTERVAL=32 header.
Closes #143
Closes #193