develop
Tests: Fix the Go unit test suite on MariaDB #5753
Tests: Improve isolation and add fixes #5263
Links: Use canonical trailing-slash form for website URLs
Docs: Split AGENTS guides into a hierarchical structure
CI: Apply Go linter recommendations to "internal/service" packages #5330
Auth: Land cluster sign-out on the Portal login without return_to
Backend: Clean up error handling and unit tests in internal/ packages
Cluster: Declare per-node group config via instance env/flags
Cluster: Add GroupsSrc to the node DTO for group-config provenance
Cluster: Improve usage of canonical terms in code/docs based on glossary
Security: Add gosec fixes with shared URL and fs validation helpers