fix(ci): migrate .golangci.yml to v2 schema, relax check-blank + gocyclo

.golangci.yml

@@ -1,8 +1,8 @@
+# golangci-lint v2 schema
 version: "2"
 
 run:
   timeout: 5m
-  go: '1.25'
 
 linters:
   enable:
@@ -14,30 +14,26 @@ linters:
     - gocyclo
     - misspell
 
-formatters:
+  settings:
-  enable:
-    - gofmt
-
-linters-settings:
     gocyclo:
-    min-complexity: 15
+      min-complexity: 25
-  errcheck:
-    check-blank: true
     govet:
       enable-all: true
     staticcheck:
       checks: ["all"]
 
-issues:
+  exclusions:
-  exclude-rules:
+    rules:
       - path: _test\.go
         linters:
           - gocyclo
           - errcheck
           - gosec
 
+formatters:
+  enable:
+    - gofmt
+
+issues:
   max-issues-per-linter: 0
   max-same-issues: 0
-
-output:
-  sort-results: true