v0.1.0

First release. There is no prior version to diff against, so this entry
summarizes the feature surface rather than a set of changes.

Added

• Compile-time macros — [[cccc::macro]]/__attribute__((macro))/@macro
  functions that run during compilation, with quasi-quoting, hygienic
  reflection, and AST construction helpers (see man/MACROS.md)
• Native compilation pipeline — -c=native hands CCCC-preprocessed C to
  a real system compiler (CCCC_NATIVE_CC, cc, clang, or gcc) for a
  production build with no VM overhead
• Register-based bytecode VM — 32 integer + 32 floating-point registers,
  a portable instruction set, and a built-in interpreter (see man/VM.md)
• Memory safety suite — four preset levels (-0 through -3) covering
  use-after-free, buffer overflows, dangling pointers, uninitialized reads,
  integer overflow, CFI, and more (see man/SAFETY.md)
• Interactive debugger — breakpoints, watchpoints, register/memory
  inspection, and a source map export API (see man/TOOLING.md)
• Interactive REPL — -r/--repl, incremental compilation, multi-line
  continuation, session commands
• Bytecode optimizer — -O[N]/--optimize[=N] levels 1-4 with
  individually toggleable passes (see man/OPTIMIZATION.md)
• URL includes — #include <https://...>, optional (CCCC_HAS_CURL=1)
• Decimal floating-point — _Decimal32/64/128 via the Intel BID library,
  optional (CCCC_HAS_DECIMAL=1)
• Built-in test framework — [[cccc::test]], Assert* macros, TAP output
  (see man/TESTING.md)
• Attribute support — GNU __attribute__, C23 [[...]], @name
  shorthand (see man/COVERAGE.md)
• JSON reflection output — --ffi-decls dumps declarations for FFI
  wrapper generation
• VM heap — intercepting allocator on by default at every safety level
• --version — prints version, git describe, host triple, and enabled
  build features
• Release build mode — ./cccc --build build.c --build-target=release
  (host -O2 -g -DNDEBUG), distinct from CCCC's own guest-side
  --optimize/safety levels
• Supported platforms: macOS and Linux, aarch64 and x86_64