Studio: add UNSLOTH_SKIP_AUTOSTART installer flag

[danielhanchen]

Summary

• add UNSLOTH_SKIP_AUTOSTART to the POSIX and PowerShell Studio installers
• skip the interactive post-install launch prompt for truthy values while preserving the existing default behavior
• forward the opt-out through the managed WSL distro reroute and document macOS/Linux/WSL and Windows usage
• add regression coverage for combined UNSLOTH_NO_TORCH + autostart parsing, prompt gating, documentation, and WSL forwarding
• run the focused parser tests natively in the existing Windows/macOS parity matrix

Tests

• uv run --no-project --with pytest python -m pytest -q tests/test_installer_skip_autostart.py tests/python/test_cross_platform_parity.py tests/test_studio_install_workspace_guard.py
• bash tests/sh/test_strixhalo_wsl_reroute.sh
• bash tests/sh/test_tauri_install_exit_order.sh
• bash tests/sh/test_mac_intel_compat.sh
• sh -n install.sh
• PowerShell AST parse of install.ps1
• ruff check tests/test_installer_skip_autostart.py
• workflow trigger lint (45 passed; full workflow tree clean)

[gemini-code-assist]

Code Review

This pull request introduces the UNSLOTH_SKIP_AUTOSTART environment variable to both the bash (install.sh) and PowerShell (install.ps1) installers, allowing users to bypass the interactive post-install prompt that launches Unsloth Studio. This is useful for automated installations. The changes are documented in the README.md and verified with new tests. Feedback suggests adding a platform check to skip the POSIX-specific test on environments where sh is unavailable (such as native Windows) to prevent test failures.

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[danielhanchen]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🚀

Reviewed commit: 8baf68f5b5

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