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>

.gitignore

@@ -0,0 +1,2 @@
+node-lookup
+dist/