build: replace qqq.version override with opt-in qqq-snapshot profile

Plan B1 step 3 asks for a qqq-snapshot profile. It imports
qqq-bom-pom:${qqq.snapshot.version} (default 4.1.0-SNAPSHOT) ahead of the
parent's BOM and adds the Central snapshots repository. The old
qqq-version-override profile turned on only when -Dqqq.version was set, so
-Pqqq-snapshot did nothing and the build quietly stayed on qqq 4.0.0.
README.md and CLAUDE.md now describe the new profile.

Part of QRun-IO/qqq-all#1

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -14,7 +14,7 @@ mvn test             # Run unit tests
 mvn test -Dtest=ClassName  # Run single test class
 mvn package          # Build JAR
 mvn verify           # Full verify, including integration tests
-mvn verify -Dqqq.version=4.1.0-SNAPSHOT  # Verify against another qqq version
+mvn verify -Pqqq-snapshot  # Verify against 4.1.0-SNAPSHOT (override with -Dqqq.snapshot.version)
 ```
 
 Integration tests (require Docker) run via `mvn verify` using maven-failsafe-plugin.
@@ -71,7 +71,7 @@ Integration tests use `@ExtendWith(RequiresDockerCondition.class)`: skipped with
 ## Dependencies
 
 - Java 21
-- Parent `com.kingsrook:qbit-build-parent:2.0.0`, the only source of the qqq version (QQQ 4.0.0); do not re-import `qqq-bom-pom` here (ADR-0007), except in the opt-in `qqq-version-override` profile that `-Dqqq.version` activates
+- Parent `com.kingsrook:qbit-build-parent:2.0.0`, the only source of the qqq version (QQQ 4.0.0); do not re-import `qqq-bom-pom` here (ADR-0007), except in the opt-in `qqq-snapshot` profile (`-Pqqq-snapshot`), which imports `qqq-bom-pom:${qqq.snapshot.version}` (default 4.1.0-SNAPSHOT) and adds the Central snapshots repository
 - OpenSearch Java Client 2.10.0
 - Apache HttpClient5 and jackson-datatype-jsr310, versions managed by the qqq BOM (keep them unpinned so they match its httpcore5 and jackson)
 - JUnit 5 + AssertJ + Mockito for testing

README.md

@@ -346,12 +346,13 @@ Index `wmsItem` and `wmsLocation` for warehouse item and location search.
 mvn test                    # Run unit tests
 mvn verify                  # Run unit tests + integration tests (requires Docker)
 mvn test -Dtest=ClassName   # Run single test class
-mvn verify -Dqqq.version=4.1.0-SNAPSHOT   # Verify against another qqq version
+mvn verify -Pqqq-snapshot    # Verify against the next qqq line (4.1.0-SNAPSHOT)
 ```
 
-The qqq version comes from `qbit-build-parent`. Setting `qqq.version` activates
-the `qqq-version-override` profile, which imports that version of `qqq-bom-pom`
-instead.
+The qqq version comes from `qbit-build-parent`. The opt-in `qqq-snapshot`
+profile imports `qqq-bom-pom` at `${qqq.snapshot.version}` (default
+`4.1.0-SNAPSHOT`) ahead of the parent's BOM and adds the Central snapshots
+repository. Pick another version with `-Dqqq.snapshot.version=...`.
 
 Without Docker, integration tests are skipped locally. With `CI=true`, they fail
 instead, so a CI build cannot pass with its integration tests silently skipped.

pom.xml

@@ -219,27 +219,37 @@
    </build>
 
    <profiles>
-      <!-- The qqq version comes only from qbit-build-parent (ADR-0007).  This     -->
-      <!-- profile exists solely to verify against another qqq line, and is only -->
-      <!-- active when invoked with e.g. -Dqqq.version=4.1.0-SNAPSHOT.           -->
+      <!-- Opt-in check against the next qqq line: mvn -B verify -Pqqq-snapshot       -->
+      <!-- (override the version with -Dqqq.snapshot.version=...).  Default builds   -->
+      <!-- take the qqq version only from qbit-build-parent (ADR-0007).              -->
       <profile>
-         <id>qqq-version-override</id>
-         <activation>
-            <property>
-               <name>qqq.version</name>
-            </property>
-         </activation>
+         <id>qqq-snapshot</id>
+         <properties>
+            <qqq.snapshot.version>4.1.0-SNAPSHOT</qqq.snapshot.version>
+         </properties>
          <dependencyManagement>
             <dependencies>
                <dependency>
                   <groupId>com.kingsrook.qqq</groupId>
                   <artifactId>qqq-bom-pom</artifactId>
-                  <version>${qqq.version}</version>
+                  <version>${qqq.snapshot.version}</version>
                   <type>pom</type>
                   <scope>import</scope>
                </dependency>
             </dependencies>
          </dependencyManagement>
+         <repositories>
+            <repository>
+               <id>sonatype-snapshots</id>
+               <url>https://central.sonatype.com/repository/maven-snapshots/</url>
+               <releases>
+                  <enabled>false</enabled>
+               </releases>
+               <snapshots>
+                  <enabled>true</enabled>
+               </snapshots>
+            </repository>
+         </repositories>
       </profile>
    </profiles>
 </project>