[Vladyslav-Kuksiuk]

Summary

Upgrade Embed Code to Go 1.27.3 to keep the project on the latest stable Go release.

Changes

• Keep linting compatible with Go 1.27 using golangci-lint 2.15.0.
• Synchronize documented Go requirements and contributor guidance.
• Increment the application version to 1.2.6.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.81%. Comparing base (7c9c66e) to head (a8eaf66).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   96.29%   96.81%   +0.51%     
==========================================
  Files          43       43              
  Lines        3078     2635     -443     
==========================================
- Hits         2964     2551     -413     
+ Misses         97       84      -13     
+ Partials       17        0      -17     

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[Copilot]

🟢 Approved

The narrowly scoped version updates are consistent across configuration and documentation, with no unresolved blocking findings.

No open issues 🎉

What changed in this PR

Updates Embed Code’s Go toolchain to 1.27.3 and aligns linting, documentation, and contributor guidance.

Changes:

• Set the module and linter Go versions to 1.27.3.
• Update CI to golangci-lint 2.15.0 and synchronize documented requirements.
• Increment the application version to 1.2.6.

File	Description
VERSION	Bumps the application version to 1.2.6.
README.md	Updates the Go requirement for source builds.
go.mod	Sets Go 1.27.3 as the module requirement.
.golangci.yml	Aligns the linter’s Go target with the module.
.github/​workflows/​check.yml	Updates golangci-lint to 2.15.0.
.github/​copilot-instructions.md	Synchronizes Go and linter version guidance.

_{Review effort: Balanced}