feat: add bump-version.sh script for version management

Automates version bumps across all version source files:
- Cargo.toml (PRIMARY - workspace.package.version)
- debian/changelog (prepend new entry)
- debian/control (update Version field)
- scripts/build-package.sh (update VERSION variable)
- frontend/package.json (update version field)
- Stale references check after bump

Usage: ./scripts/bump-version.sh <new_version> <old_version>

.gitignore

@@ -0,0 +1,29 @@
+# Agent Zero project data
+.a0proj/
+
+# Python environments & cache
+venv/**
+**/__pycache__/**
+
+# Node.js dependencies
+**/node_modules/**
+**/.npm/**
+
+# IDE
+.vscode/
+.idea/
+
+# Backup files
+*.bak
+*.bak.*
+
+# Rust build artifacts
+/target
+
+# Frontend dependencies
+frontend/node_modules
+frontend/dist
+
+# Package build artifacts
+*.deb
+package-build/