fix: use golangci-lint v2 config format for exclusion rules

issues.exclude-rules was renamed to linters.exclusions.rules in v2.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gcmsg

.golangci.yml

@@ -6,21 +6,21 @@ linters:
     - staticcheck
     - unused
 
-issues:
-  exclude-rules:
-    # Exclude errcheck in test files – test helpers rarely need error checking.
-    - path: _test\.go
-      linters:
-        - errcheck
+  exclusions:
+    rules:
+      # Exclude errcheck in test files – test helpers rarely need error checking.
+      - path: _test\.go
+        linters:
+          - errcheck
 
-    # nhooyr.io/websocket is deprecated in favour of github.com/coder/websocket.
-    # Migration is tracked separately; suppress SA1019 for the signaling package.
-    - path: internal/signaling/
-      linters:
-        - staticcheck
-      text: "SA1019"
+      # nhooyr.io/websocket is deprecated in favour of github.com/coder/websocket.
+      # Migration is tracked separately; suppress SA1019 for the signaling package.
+      - path: internal/signaling/
+        linters:
+          - staticcheck
+        text: "SA1019"
 
-    # QF1002 (convert if/else-if chain to tagged switch) is a style suggestion.
-    - linters:
-        - staticcheck
-      text: "QF1002"
+      # QF1002 (convert if/else-if chain to tagged switch) is a style suggestion.
+      - linters:
+          - staticcheck
+        text: "QF1002"