chore: bump version to 0.3.0

Major release including:
- Security: path validation, temp dir cleanup, output limits
- Architecture: constants/utils modules, cleaner structure
- Performance: fast string heap search, pagination, PE validation
- Testing: comprehensive test suite (165 tests)
- Fixes: ilspycmd output parsing, decompile stdout handling

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mcilspy"
-version = "0.2.0"
+version = "0.3.0"
 description = "MCP Server for ILSpy .NET Decompiler"
 authors = [
     {name = "Ryan Malloy", email = "ryan@supported.systems"}