Fix missing flake input in README

[lucperkins]

The nix-darwin example uses inputs.determinate but doesn't add determinate to the flake inputs.

Summary by CodeRabbit

• Documentation
  • Updated the nix-darwin configuration example to use version 3 of the Determinate flake input.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6069a65 and 7c6d3a6.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The nix-darwin configuration example in README.md now declares the determinate flake input from the FlakeHub version 3 URL.

Changes

nix-darwin Example

Layer / File(s)	Summary
Update determinate flake input README.md	The nix-darwin example adds the determinate flake input with the FlakeHub version 3 URL.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 7c6d3

This is a localized README fix that makes the documented flake inputs consistent with the example usage; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README change that adds the missing flake input.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-determinate-flake-input-in-readme

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[colemickens]

personally, I'd yoink the { self, ...}@ bit and just leave it as inputs. I really don't like the destructing here and try to undo it anywhere I see it.

(Also avoids the issue where nix will populate those destructured fields from the registry if they're not in the inputs [we warn, but still...])

totally a nit though