Complete golangci-lint v2 configuration with standard linters

- Use 'standard' linter set as baseline instead of 'none'
- Disable problematic linters (typecheck, varnamelen, wsl)
- Add useful additional linters (goconst, gocyclo, gosec, misspell, etc.)
- Configure linter settings for errcheck, govet, gocyclo, goconst, gosec
- Add comprehensive exclusion rules for test files, examples, and specific patterns
- This should provide a working v2 configuration that passes CI

Author: vnykmshr

.golangci.yml

@@ -2,17 +2,79 @@ version: "2"
 
 run:
   timeout: 5m
+  modules-download-mode: readonly
 
 linters:
-  default: none
+  default: standard
+  disable:
+    # Disable overly strict linters for this project
+    - typecheck  # Handled by Go compiler
+    - varnamelen # Too strict for our use case
+    - wsl        # Too opinionated about whitespace
   enable:
-    - errcheck
-    - gosimple
-    - govet
-    - ineffassign
-    - staticcheck
-    - unused
+    # Add some useful additional linters
+    - goconst
+    - gocyclo
+    - gosec
+    - misspell
+    - unconvert
+    - unparam
+
+linters-settings:
+  errcheck:
+    check-type-assertions: true
+    check-blank: true
+
+  govet:
+    check-shadowing: true
+
+  gocyclo:
+    min-complexity: 15
+
+  goconst:
+    min-len: 2
+    min-occurrences: 2
+
+  gosec:
+    excludes:
+      - G404 # Use of weak random number generator is acceptable for cache keys
 
 issues:
+  exclude-rules:
+    # Test files are allowed to be less strict
+    - path: _test\.go
+      linters:
+        - gosec
+        - errcheck
+        - goconst
+        - unparam
+        - gocyclo
+
+    # Benchmark files focus on performance
+    - path: bench_test\.go
+      linters:
+        - errcheck
+        - unparam
+
+    # Example files can be less strict
+    - path: examples/
+      linters:
+        - gosec
+
+    # Reflection code needs some flexibility
+    - path: pkg/obcache/wrap\.go
+      linters:
+        - errcheck
+
+    # Allow string keys in context for testing
+    - text: "should not use built-in type string as key"
+      linters:
+        - staticcheck
+
+    # Allow empty branches in example code
+    - text: "empty branch"
+      linters:
+        - staticcheck
+
   max-issues-per-linter: 0
   max-same-issues: 0