Add module READMEs, .gitignore, and remove Bin/ from tracking

Add README.md for each library module documenting API, platform
backends, and usage. Add .gitignore for build artifacts. Remove
pre-built binaries from version control.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ZUtil/README.md

@@ -0,0 +1,45 @@
+# ZUtil
+
+C++ utility library providing RAII wrappers around the libsst C modules, plus
+custom containers, serialization, and logging.
+
+## Memory management
+- `ZAlloc` / `ZAllocWindow` -- tracked allocation with checkpoint support
+- `ZSlabAllocator` -- slab-based allocator
+- `ZSmartPointer<T>` (alias `ZPtr<T>`) -- thread-safe reference-counted smart pointer
+- `ZWeakPointer<T>` -- weak references
+- `ZReferenceCounter`, `ZReferenceBuffer`
+
+## Containers (ZSTL)
+- `ZArray` -- dynamic array with sort/search algorithms
+- `ZList` -- linked list with algorithms
+- `ZHashMap` -- hash table
+- `ZRingBuffer` -- circular buffer
+- `ZBasicString` / `ZString` -- string with algorithms
+- `ZName` -- immutable string with hash-cached comparison
+- `ZKVTree` -- hierarchical key-value tree (path-addressable)
+- `ZRegistry` -- thread-safe key-value store
+
+## Threading
+- `ZThread` -- base class with `run()` override and request marshaling
+- `ZMutex` / `ZLock` -- RAII mutex and scoped lock
+- `ZEvent`, `ZSemaphore`, `ZReadWriteLock` -- RAII sync wrappers
+- `ZTaskStream` -- multi-threaded task execution with `ZFuture<R,A>`
+
+## Serialization
+- `ZBinaryReader` / `ZBinaryWriter` -- abstract binary I/O
+- `ZBinaryBufferReader` / `ZBinaryBufferWriter` -- in-memory binary streams
+- `ZBinaryFileReader` / `ZBinaryFileWriter` -- file-backed binary streams
+- `ZXMLReader` / `ZXMLWriter` -- XML via ZKVTree
+- `ZJSONReader` / `ZJSONWriter` -- JSON via ZKVTree
+- `ZIniReader` / `ZIniWriter` -- INI format
+
+## Logging
+- `ZLog` -- thread-safe, multi-file logging with severity levels
+- Macros: `SystemLogError`, `SystemLogWarning`, `SystemLogInfo`, `SystemLogSpam`
+
+## Utilities
+- `ZRandomGenerator` -- PRNG wrapper with Gaussian support
+- `ZSimplexNoise` / `ZSimplexNoiseMap` -- noise generation
+- `ZAssert` -- debug/runtime assertion macros
+- `ZBitmap` -- bitmap data structure