Add pburl and pblastreport companion tools to the RPM

node-lookup output is useful for pivoting to Puppetboard, but there was no
quick way to turn a list of hosts into Puppetboard node-page URLs or to see
when each host last ran Puppet. These two tools close that gap and ship in the
same RPM so they are available wherever node-lookup is.

- Add pburl: reads hostnames from args or piped node-lookup output and prints
  "<host> <puppetboard-node-page-url>".
- Add pblastreport: prints "<host>\t<last-report-time>\t<url>" using
  report_timestamp from the PuppetDB v4 nodes endpoint. Supports --relative/-r
  (relative age) and --timezone/-z <IANA> (default: local timezone).
- Add internal/puppet package shared by both tools: config load, PuppetDB
  nodes query, Puppetboard URL construction, and no-TTY-safe stdin host reading.
- Add puppetboard_url config key (env NODE_LOOKUP_PUPPETBOARD_URL) to the
  shared config so config init/show scaffold it for the whole tool family.
- Build all three binaries individually (each is its own main package) and
  generate per-binary bash/zsh/fish completions in the Makefile, build-rpm.sh,
  and nfpm spec; cross-compile and attach all three per os/arch in the release
  pipeline.
- Document the tools, config key, and env var in AGENTS.md.

cmd/pburl/main.go

@@ -0,0 +1,63 @@
+// Command pburl prints the Puppetboard node-page URL for each host it is given.
+//
+// It reads hostnames from its arguments or from piped node-lookup output and
+// emits "<host> <puppetboard-url>" per line:
+//
+//	node-lookup -R | pburl
+//	pburl host1.example.net host2.example.net
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"node-lookup/internal/puppet"
+
+	"github.com/spf13/cobra"
+)
+
+var version = "dev"
+
+func main() {
+	cfg, err := puppet.Load()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "config error:", err)
+		os.Exit(1)
+	}
+
+	var boardURL string
+
+	root := &cobra.Command{
+		Use:   "pburl [host...]",
+		Short: "Print the Puppetboard node-page URL for each host.",
+		Long: "Reads hostnames from arguments or piped node-lookup output and prints\n" +
+			"'<host> <puppetboard-url>' for each. Example: node-lookup -R | pburl",
+		Args:         cobra.ArbitraryArgs,
+		SilenceUsage: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if cmd.Flags().Changed("puppetboard-url") {
+				cfg.PuppetboardURL = boardURL
+			}
+			hosts := puppet.ReadHosts(os.Stdin, args)
+			if len(hosts) == 0 {
+				return fmt.Errorf("no hosts given (pass as arguments or pipe node-lookup output)")
+			}
+			for _, h := range hosts {
+				fmt.Printf("%s %s\n", h, puppet.HostPageURL(cfg.PuppetboardURL, h))
+			}
+			return nil
+		},
+	}
+	root.Flags().StringVar(&boardURL, "puppetboard-url", cfg.PuppetboardURL, "Puppetboard base URL (overrides config and NODE_LOOKUP_PUPPETBOARD_URL)")
+
+	root.AddCommand(&cobra.Command{
+		Use:          "version",
+		Short:        "Print the version",
+		Run:          func(cmd *cobra.Command, args []string) { fmt.Println(version) },
+		SilenceUsage: true,
+	})
+
+	if err := root.Execute(); err != nil {
+		os.Exit(1)
+	}
+}