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>

.pre-commit-config.yaml

@@ -0,0 +1,17 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-merge-conflict
+      - id: mixed-line-ending
+        args: [--fix=lf]
+
+  - repo: https://github.com/dnephin/pre-commit-golang
+    rev: v0.5.1
+    hooks:
+      - id: go-fmt
+      - id: go-vet
+      - id: go-unit-tests