chore(release): update package version to 1.0.89

Makefile

@@ -16,7 +16,7 @@ GOCLEAN=$(GOCMD) clean
 
 # Tool versions (compiled on demand via `go run` so they match the local toolchain)
 GOLANGCI_LINT = go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest
-STATICCHECK   = go run honnef.co/go/tools/cmd/staticcheck@latest
+STATICCHECK   = build/tools/staticcheck
 GOVULNCHECK   = go run golang.org/x/vuln/cmd/govulncheck@latest
 
 # Version information
@@ -63,7 +63,16 @@ fmt-check: ## Check formatting (gofumpt + goimports via golangci-lint)
 	@diff=$$($(GOLANGCI_LINT) fmt --diff --config=.golangci.json); \
 	if [ -n "$$diff" ]; then echo "$$diff"; echo "Run: make fmt"; exit 1; fi
 
-staticcheck: ## Run staticcheck
+# staticcheck is built against the latest golang.org/x/tools so it can read export
+# data from the newest Go toolchain (`go run ...@latest` uses an older, pinned x/tools).
+$(STATICCHECK):
+	@echo "Building staticcheck..."
+	@mkdir -p build/tools/src
+	@cd build/tools/src && { [ -f go.mod ] || go mod init staticcheck-build >/dev/null 2>&1; } && \
+		go get honnef.co/go/tools/cmd/staticcheck@latest golang.org/x/tools@latest && \
+		go build -o ../staticcheck honnef.co/go/tools/cmd/staticcheck
+
+staticcheck: $(STATICCHECK) ## Run staticcheck
 	@echo "Running staticcheck..."
 	$(STATICCHECK) ./...