v0.4.0

• ENH: Added meson-python metadata provider for dynamic version discovery with meson-python build backend
• BUG: Fixed relative import failure during flit_core metadata extraction by adding fallback to file-based import
• MAINT: Renamed internal module Discovery.py to discovery.py (PEP 8 compliance)
• MAINT: Added keywords and improved classifiers in pyproject.toml for better discoverability