fix: use msgpack binary headers

[banteg]

Summary

• encode binary values with MessagePack bin8/bin16/bin32 headers
• decode binary values from bin headers while still accepting string headers
• route Unpacker.readBinary() through the binary decoder
• make the Binary wrapper test exercise Binary instead of String

Bug

The binary helpers were using MessagePack string headers (fixstr/str8/str16/str32) instead of the binary header family (bin8/bin16/bin32). As a result, packBinary() produced values tagged as strings, and unpackBinary() could not read correctly tagged binary payloads from other MessagePack implementations.

The public Unpacker.readBinary() method had the same issue because it called unpackString() instead of unpackBinary(). The existing "Binary struct" test did not catch this because it accidentally encoded and decoded String, not Binary.

This keeps decode compatibility for previously string-tagged binary bytes by continuing to accept string headers in unpackBinaryHeader(), but new binary encodes now use the MessagePack binary tags.

Tests

• env PATH=/Users/banteg/.cache/zig/toolchains/zig-aarch64-macos-0.15.1:$PATH ./check.sh --ci

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📥 Commits

Reviewing files that changed from the base of the PR and between ca0f153 and 4c5b061.

📒 Files selected for processing (3)

• src/any.zig
• src/binary.zig
• src/msgpack.zig

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🧪 Generate unit tests (beta)

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[lalinsky]

Oh wow. How did i mess this up? Thank you.