Check Nix dependencies weekly

[kixelated]

Change Dependabot's Nix schedule from monthly to weekly, matching the other ecosystems, and update the accompanying documentation.

Validation: git diff --check passed.

(written by GPT-6)

[coderabbitai]

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• .github/dependabot.yml
• CLAUDE.md

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-10T19:13:13.280737Z	c826b55	PR opened

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