Add Marionette

[sb2bg]

Adds sb2bg/marionette to the Documentation and Testing section — a deterministic simulation testing library for Zig with a std.Io implementation that lets you inject faults and replay failures from seeds.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a new entry to the README's testing tools list for the marionette library, which provides deterministic simulation testing for Zig.

Changes:

• Adds a single bullet linking to sb2bg/marionette under the testing tools section.

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[gemini-code-assist]

Code Review

This pull request adds the marionette library, a deterministic simulation testing tool for Zig, to the README. The review feedback correctly points out that the standard library I/O module should be referred to as 'std.io' (lowercase) instead of 'std.Io' to align with Zig's naming conventions.

[gemini-code-assist]

In Zig, the standard library I/O module is named std.io (lowercase), not std.Io. Correcting this ensures the description is accurate and consistent with Zig's naming conventions.

Suggested change

	- [sb2bg/marionette](https://github.com/sb2bg/marionette) - Deterministic simulation testing for Zig with a `std.Io` implementation, letting you inject faults and replay failures from seeds.
	- [sb2bg/marionette](https://github.com/sb2bg/marionette) - Deterministic simulation testing for Zig with a `std.io` implementation, letting you inject faults and replay failures from seeds.

[jiacai2050]

Thanks, that's a interesting project.