build: move NOTICE check to verify phase (#2526)

The maven-notice-plugin check was bound to the validate phase, the
first phase of the build lifecycle, so any local compile/test run
would fail on a stale NOTICE file before reaching compilation. Moving
it to verify keeps the check enforced for full builds (mvn verify,
install) while no longer gating iterative compile/test cycles.


Claude-Session: https://claude.ai/code/session_014bfbZJZz7o45q4S1mikU1A

Co-authored-by: Claude <noreply@anthropic.com>

Author: jfallows

pom.xml

@@ -282,7 +282,7 @@
           </configuration>
           <executions>
             <execution>
-              <phase>validate</phase>
+              <phase>verify</phase>
               <goals>
                 <goal>check</goal>
               </goals>