chore: upgrade Go to 1.26

[sylr]

Summary

• Upgrade Go toolchain from 1.25 to 1.26 in nix dev shell
• Update nix flake lock file

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c5ddfcdd-b61a-4205-8020-02340f60eeb2

📥 Commits

Reviewing files that changed from the base of the PR and between c9fd897 and 0fc9947.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock, !**/*.lock

📒 Files selected for processing (1)

• flake.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

📝 Coding Plan

• Generate coding plan for human review comments

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (c9fd897) to head (0fc9947).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #179   +/-   ##
===========================
===========================

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