numeric-leaves vectors: reads, writes and a mixed record, written by the C# reference

Regenerated twice on Yggdrasil under CULTCACHE_WRITE_VECTORS=1 and byte-identical. The cultcache-ts test still
imports the deleted hand table until the next commit, so this commit and its parent do not build the TS tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/vectors/numeric-leaves/README.md

@@ -0,0 +1,14 @@
+# numeric-leaves vectors
+
+Written only by the C# reference, `tests/GameCult.Caching.Tests/NumericLeafVectorTests.cs`, with
+`CULTCACHE_WRITE_VECTORS=1`. Every other run reads these files and compares them byte for byte; a changed vector is a
+reviewed commit. Other runtimes decode them and are held to the same answers.
+
+A document with one slot, `[value]`, whose slot is a C# `int`, `long`, `float` or `double` (leaf `int32`, `int64`,
+`float32`, `float64`).
+
+- `reads.msgpack`: an array of `[leaf, payload, accepted, bits]`. `payload` (bin) is the one-slot record fed to the
+  reference; `accepted` is whether it read; `bits` (bin, 8 bytes, big-endian) is the int64 it read, or the IEEE bits of
+  the double it read (a float32 widened), and empty when refused. Every value is fed to every leaf.
+- `writes.msgpack`: an array of `[leaf, text, bytes]`. `text` is a decimal for an integer leaf and the double's IEEE
+  bits in hex for a float leaf; `bytes` (bin) is the one-slot record the reference writes for that value.