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>

ZTestSuite/README.md

@@ -0,0 +1,44 @@
+# ZTestSuite
+
+Unit test suite covering the libsst and ZUtil libraries.
+
+## Running
+
+```sh
+make ztestsuite
+./ZTestSuite.bin        # interactive menu
+./ZTestSuite.bin -n     # run all tests non-interactively
+./ZTestSuite.bin -r 5   # run test block #5
+./ZTestSuite.bin -c     # print total test count
+```
+
+## Test framework
+
+Custom lightweight framework (`ZUnitTest.hpp`):
+
+```cpp
+static const char* testExample() {
+    TASSERT(1 + 1 == 2, "math is broken");
+    return ZTEST_SUCCESS;
+}
+```
+
+Tests return an error string on failure or `ZTEST_SUCCESS` (empty string)
+on pass.
+
+## Coverage (48 test blocks, 60 test files)
+
+**Math** -- Vec2/3/4 and Mat22/33/44 in float/double/int/unsigned variants,
+geometry, transforms, safe arithmetic, endianness
+
+**Containers** -- ZArray, ZList, ZHashMap, ZRingBuffer, ZBasicString (with
+algorithm suites)
+
+**Memory** -- ZAlloc, ZAllocWindow, ZSlabAllocator, ZReferenceCounter,
+ZSmartPointer, ZWeakPointer
+
+**I/O** -- JSON, XML, INI readers/writers, binary data writer
+
+**Concurrency** -- threads, task streams
+
+**Utilities** -- assertions, ZName, ZRegistry, random generation, simplex noise