+ add FPAQ0 order-0 arithmetic building block - #108
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Reuses the binary arithmetic coder with order-0 byte-prefix contexts: each branch starts uniform, adapts after every bit and rescales before its counts grow large. The envelope stays self-delimiting with a four-byte length. A rejection test held a stackalloc span and then read it from inside a lambda, which the release build refuses.
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What changed
Fpaq0BuildingBlockas a missing entropy-coding primitiveVerification
Added NUnit coverage for:
A local .NET SDK is not available in this execution environment, so repository CI performs the compile and test run.