[RELEASE] Bump version to 3.20.0

Release v3.20.0: Single-Shot Compile Command

**Version Update**: 3.19.30 → 3.20.0

**Major Feature**: `depyler compile` command
- Compile Python scripts to standalone native binaries
- Cross-platform support (Windows/Linux/macOS)
- Build profile options (release/debug)
- Custom output paths
- Visual progress feedback

**Quality Assurance**:
- ✅ All tests passing (7/7 compile tests)
- ✅ TDG Score: 95.5/100 (A+)
- ✅ Complexity: All functions ≤10
- ✅ Clippy: Zero warnings
- ✅ Build verified: Success

**EXTREME TDD Protocol**: RED → GREEN → REFACTOR completed
**Ticket**: DEPYLER-0380

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: noahgift

Cargo.toml

@@ -19,7 +19,7 @@ max_cyclomatic_complexity = 15
 required_documentation_coverage = 100.0
 
 [workspace.package]
-version = "3.19.30"
+version = "3.20.0"
 edition = "2021"
 authors = ["Depyler Contributors"]
 license = "MIT OR Apache-2.0"