Initial commit: Go rewrite of node-lookup

Query PuppetDB for node facts via CLI. Replaces the original Python script.

- XDG config (~/.config/node-lookup/config.yaml) with env var overrides
- All flags from original tool preserved (-n, -F, -R, -m, --pm, -1, -2, -C, -A, -j)
- config init / config show subcommands
- Unit tests (23), Makefile, GoReleaser config, pre-commit hooks

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

Makefile

@@ -0,0 +1,21 @@
+BINARY   := node-lookup
+GOFLAGS  := -ldflags="-s -w"
+
+.PHONY: all build test lint clean install
+
+all: build
+
+build:
+	go build $(GOFLAGS) -o $(BINARY) ./...
+
+test:
+	go test -v -race ./...
+
+lint:
+	golangci-lint run ./...
+
+clean:
+	rm -f $(BINARY)
+
+install:
+	go install $(GOFLAGS) ./...