chore: upgrade Go to 1.26

[sylr]

Summary

• Upgrade Go toolchain from 1.23 to 1.26 in nix dev shell
• Modernize flake.nix to use stable/unstable nixpkgs split
• Use allowUnfreePredicate instead of allowUnfree = true
• Update nix flake lock file

🤖 Generated with Claude Code

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

Updated Nix flake to use two separate nixpkgs instances (stable and unstable) instead of one, removed custom Go version overlay, and reorganized package composition to source tools from appropriate channels with selective unfree package allowance.

Changes

Cohort / File(s)	Summary
Nix Flake Configuration flake.nix	Added dual nixpkgs inputs (stable v0.2511 and unstable v0.1), updated outputs function signature to accept both packages, removed custom Go overlay, partitioned devShell composition to draw Go from stable and linting tools from unstable, changed unfree allowance to target only goreleaser-pro.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~50 minutes

Poem

🐰 Two nixpkgs, they now dance in tandem,
Stable and wild, a package random,
No overlay chains, just pure and clean,
The finest tooling the flake has seen! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: upgrade Go to 1.26' directly describes the main change of upgrading the Go toolchain version in the development shell, which is the primary objective.
Description check	✅ Passed	The description provides relevant details about the changeset including Go upgrade, flake.nix modernization, unfree package handling changes, and lock file updates, all aligned with the actual modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/upgrade-go

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