v0.2.0 toml-only, harden concurrency and env export, dep updates

.github/workflows/test.yml

@@ -0,0 +1,18 @@
+name: Test
+on: [push, pull_request]
+permissions:
+  contents: read
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - run: go test -timeout 60s -race ./...
+      - run: GOARCH=386 go test -timeout 60s ./...
+      - run: go vet ./...
+      - run: go test -run '^$' -fuzz '^FuzzConfigNumericConversions$' -fuzztime=10s -parallel=2
+      - run: GOOS=windows GOARCH=amd64 go test -c -o /tmp/config-windows.test.exe .