feat: add standalone Makefile + honest README claims

Makefile (no CMake needed):
  make                  # build tq_run + tq_convert
  make CC=gcc           # Linux gcc
  make METAL=1          # macOS Metal GPU
  make DEBUG=1          # ASan + UBSan
  make help             # show all options

  Auto-detects: NEON (arm64), AVX2 (x86_64), Accelerate (macOS)
  Cross-compile: make CC=x86_64-w64-mingw32-gcc

README (EN + KO):
  "zero quality loss" → "almost no quality loss (PPL +0.03%)"
  Weight quant: "byte-identical" → "output-identical on tested sequences"
  Added explicit notes on verification scope (30 tokens, greedy)
  Added Star History chart

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

Author: unamedkr

.gitignore

@@ -44,3 +44,9 @@ refs/
 models/.claude/worktrees/
 *.gguf
 models/
+
+# Makefile build artifacts
+tq_run
+tq_convert
+libturboquant.a
+*.o