Harden native render lifecycle - #16
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Copy and freeze Ruby string inputs before releasing the GVL so concurrent mutation cannot invalidate pointers used by Plutobook. Reject embedded NUL bytes where Ruby and C string semantics would otherwise diverge. Own each successfully created book through rb_ensure so callback errors and asynchronous interruptions always destroy native resources. Keep Ruby values alive through their final native use and cover mutation, interruption, and NUL-byte behavior in tests.
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Copy and freeze Ruby string inputs before releasing the GVL so concurrent mutation cannot invalidate pointers used by Plutobook. Reject embedded NUL bytes where Ruby and C string semantics would otherwise diverge.
Own each successfully created book through rb_ensure so callback errors and asynchronous interruptions always destroy native resources. Keep Ruby values alive through their final native use and cover mutation, interruption, and NUL-byte behavior in tests.