feat(onboarding): provide clear 60-second Rustinel evaluation installers

[Karib0u]

Purpose

Make the first Rustinel experience fast, safe, and understandable on Windows, Linux, and macOS.

Scope

• Keep one release archive per supported platform.
• Provide official Unix shell and Windows PowerShell bootstrap scripts.
• Support install.sh --run on Linux and macOS.
• Make install.ps1 launch portable evaluation by default when executed through the documented irm ... | iex one-liner.
• Continue to execute rustinel run for evaluation.
• Detect and clearly display portable mode.
• Confirm that demonstration rules are loaded.
• Disable active response in the bundled trial configuration.
• Print a safe trigger command.
• Print the alert location.
• Print the promotion path to rustinel setup.
• Preserve checksum and catalog trust verification in both installers before running the downloaded binary.
• Avoid installing services or creating managed directories.

Acceptance Criteria

• The Unix shell one-liner reaches active monitoring without manual configuration.
• The Windows PowerShell iex one-liner reaches active monitoring without manual configuration.
• The user receives a clear demonstration trigger.
• A successful detection is visible in the terminal or clearly referenced.
• No managed directories or services are created.
• Active response is disabled.
• The output ends with the permanent-deployment command.

Dependencies

• feat(cli): add rustinel setup for managed deployment #108 for final promotion messaging.

Priority

P0