Update to Go 1.25 and golangci-lint v2.6.2

- Update all workflows to use Go 1.25
- Update golangci-lint from v1.62.2 to v2.6.2 (latest version)
- v2.6.2 supports Go 1.25 and newer features

Author: claude

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: Check formatting
         run: |
@@ -38,12 +38,12 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
-          version: v1.62.2
+          version: v2.6.2
           args: --timeout=5m ./cmd/... ./internal/... ./pkg/ast/... ./pkg/parser/... ./pkg/codegen/...
 
   test:
@@ -55,7 +55,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: Download dependencies
         run: go mod download
@@ -85,7 +85,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: Build CLI
         run: go build -v -o guix ./cmd/guix
@@ -107,7 +107,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: Build CLI
         run: go build -o guix ./cmd/guix

.github/workflows/e2e.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: Set up Node.js
         uses: actions/setup-node@v4

.github/workflows/pages.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: '1.25'
 
       - name: Build CLI
         run: go build -o guix ./cmd/guix