Add MacOS support

Add --count parameter for batch forced actions

This release adds support for batch operations on multiple nodes without
delays between each operation, enabling efficient bulk management.

Features:
- Add --count parameter supporting add, remove, start, stop, upgrade actions
- Smart node selection using age field for consistent ordering
- Batch operations run sequentially without delays
- Graceful handling when count exceeds available nodes

Implementation:
- Updated config.py to add --count parameter with default of 1
- Enhanced executor.py methods to support count parameter
- Updated __main__.py to pass count from options to executor
- Maintains backward compatibility with single-node operations

Node selection logic:
- add: Creates N new nodes immediately
- remove/stop: Selects N youngest nodes (highest age values first)
- start/upgrade: Selects N oldest nodes (lowest age values first)

Testing:
- Added comprehensive test suite (7 new tests) for count parameter
- Updated test fixtures to use production node naming (antnode0001.service)
- Removed test-specific logic from executor for cleaner code
- All 56 tests passing

Version: 0.0.10

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