docs(fspy): document zero-initialized shared memory#538
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Document the shared-memory zero-initialization contract and verify every byte through owner and opened views. Co-authored-by: GPT-5.6 <codex@openai.com>
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Motivation
The shared-memory writer requires unused bytes to start at zero, but
fspy_shmdid not document that guarantee. Document the contract and add cross-platform regression coverage through owner and opened views so backend changes cannot silently violate it.Co-authored-by: GPT-5.6 codex@openai.com