v0.2.3

Added:

• Modular builders for gcc, clang, msvc
• Platform-specific binary path generation (Linux/macOS/Windows)

Changed:

• Build configuration moved to [build] (language, standard, compiler)
• dcr.toml formatting now includes the [build] section
• Build uses built-in debug/release flags per compiler
• Build compiles all *.c/*.cpp files in src/ into a single binary (no incremental build)
• Updated dcr.toml examples in documentation