Add bump2version configuration for all Python packages

Adds .bumpversion.cfg files to each Python package (agent, computer,
computer-server, core, mcp-server, pylume, som) to enable automated
version bumping with bump2version tool.

Includes comprehensive Makefile with targets for:
- Installing and managing bump2version
- Bumping package versions (major, minor, patch)
- Managing dependencies and building packages
- Running tests and formatting
- Cleaning build artifacts

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

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

libs/python/computer-server/.bumpversion.cfg

@@ -0,0 +1,9 @@
+[bumpversion]
+current_version = 0.1.0
+commit = True
+tag = False
+message = Bump cua-computer-server to v{new_version}
+
+[bumpversion:file:pyproject.toml]
+search = version = "{current_version}"
+replace = version = "{new_version}"