- Implements all placeholder Go examples in the `examples` directory.
- Corrects the `run_matrix_programmatically` example to use the `borg` package.
- Refactors the code to centralize the matrix execution logic in the `matrix` package.
- Updates the documentation to include a new "Programmatic Usage" section that describes all of the Go examples.
- Updates the "Terminal Isolation Matrix" section to remove manual 'runc' instructions, emphasizing that 'borg run' handles this process to maintain security and isolation.
- Adds missing examples for 'collect github repos', 'collect github release', and 'compile' commands to the documentation.
- Makes `pkg/matrix.Run` testable by exposing `exec.Command` as a public variable.
- Adds tests for the `matrix` package that mock the `runc` command.
- Updates the `cmd` package tests to mock `matrix.ExecCommand` instead of the old `cmd.execCommand`.
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