Add global type mutex for thread-safe type operations#7416

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Commits on Mar 15, 2026

Align BINARY_OP_EXTEND with CPython descriptor cache model
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Align type _spec_cache and latin1 singleton string paths
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Tighten CALL_ALLOC_AND_ENTER_INIT stack-space guard
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Align call-init frame flow and spec cache atomic ordering
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address review: invalidate init cache on type modification, add cspell words
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address review: check datastack space for extra_bytes, require CO_OPTIMIZED in vectorcall fast path
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Extract datastack_frame_size_bytes_for_code, skip monitoring for init_cleanup frames, guard trace dispatch
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Fix Constants newtype usage in init_cleanup_code
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type lock
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