chore: upgrade Go to 1.26

[sylr]

Summary

• Upgrade Go toolchain 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: c11792fa-6a16-4812-93f5-226d70dde7b7

📥 Commits

Reviewing files that changed from the base of the PR and between 0cb6ca6 and 6805f0c.

⛔ 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 68.50%. Comparing base (1eacbf8) to head (6805f0c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   68.50%   68.50%           
=======================================
  Files          46       46           
  Lines        4648     4648           
=======================================
  Hits         3184     3184           
  Misses       1290     1290           
  Partials      174      174           

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