concore run defaults to Windows scripts on non‑Windows systems

[Titas-Ghosh]

Description

The CLI option --type defaults to windows on every OS. On Linux/macOS, this generates build.bat/run.bat and Windows-specific commands, so the default Quick Start fails unless users explicitly pass --type posix.

Steps to reproduce

On Linux/macOS: concore init test-project
workflow.graphml((no --type)
Output contains Windows .bat scripts and commands.

Expected

Default type should match the OS (posix on Linux/macOS, windows on Windows).

Actual

Default is always windows

I have raised PR #271 for this issue , I am open to any feedback on this @pradeeban .