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.

packaging/nfpm.yaml

@@ -23,13 +23,25 @@ provides:
   - node-lookup
 
 contents:
-  # The CLI binary.
+  # The CLI binaries: node-lookup and its companion tools.
   - src: dist/node-lookup
     dst: /usr/bin/node-lookup
     file_info:
       mode: 0755
       owner: root
       group: root
+  - src: dist/pburl
+    dst: /usr/bin/pburl
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
+  - src: dist/pblastreport
+    dst: /usr/bin/pblastreport
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
 
   # Shell completions (generated by scripts/build-rpm.sh before packaging).
   - src: dist/completions/node-lookup.bash
@@ -44,3 +56,27 @@ contents:
     dst: /usr/share/fish/vendor_completions.d/node-lookup.fish
     file_info:
       mode: 0644
+  - src: dist/completions/pburl.bash
+    dst: /usr/share/bash-completion/completions/pburl
+    file_info:
+      mode: 0644
+  - src: dist/completions/_pburl
+    dst: /usr/share/zsh/site-functions/_pburl
+    file_info:
+      mode: 0644
+  - src: dist/completions/pburl.fish
+    dst: /usr/share/fish/vendor_completions.d/pburl.fish
+    file_info:
+      mode: 0644
+  - src: dist/completions/pblastreport.bash
+    dst: /usr/share/bash-completion/completions/pblastreport
+    file_info:
+      mode: 0644
+  - src: dist/completions/_pblastreport
+    dst: /usr/share/zsh/site-functions/_pblastreport
+    file_info:
+      mode: 0644
+  - src: dist/completions/pblastreport.fish
+    dst: /usr/share/fish/vendor_completions.d/pblastreport.fish
+    file_info:
+      mode: 0644