Revert CodeSystem import to R4 for consistency with provider pattern

[Copilot]

Commit 8b4d0cb changed the CodeSystem import from R4 to R5 when adding CodeableConcept validation support. This created an inconsistency with the established multi-version provider pattern.

Changes

• Reverted CodeSystemProvider.java import from org.hl7.fhir.r5.model.CodeSystem to org.hl7.fhir.r4.model.CodeSystem

Pattern

The terminology providers follow this structure:

• R4 models for method signatures and return types (e.g., searchCodeSystem())
• R5 models used internally within operations for version conversion
• getResourceType() switches on fhirVersion to return version-specific classes

This matches the existing ValueSetProvider.java implementation:

import org.hl7.fhir.r4.model.ValueSet;  // R4 for return type
import org.hl7.fhir.r5.model.Coding;    // R5 for internal ops

@Search
public List<ValueSet> searchValueSets() {
    return Collections.emptyList();
}

@Override
public Class<? extends IBaseResource> getResourceType() {
    return switch (this.fhirVersion) {
        case R4 -> org.hl7.fhir.r4.model.ValueSet.class;
        case R4B -> org.hl7.fhir.r4b.model.ValueSet.class;
        case R5 -> org.hl7.fhir.r5.model.ValueSet.class;
        // ...
    };
}

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• jitpack.io
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/matchbox/matchbox org.codehaus.plexus.classworlds.launcher.Launcher clean compile -pl matchbox-server -am -DskipTests (dns block)
• packages.fhir.org
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java -jar /home/REDACTED/work/matchbox/matchbox/matchbox-server/target/surefire/surefirebooter-20251229173241584_89.jar /home/REDACTED/work/matchbox/matchbox/matchbox-server/target/surefire 2025-12-29T17-31-28_982-jvmRun1 surefire-20251229173241584_87tmp surefire_1-20251229173241584_88tmp 4/bin/env 0 -j ACCEPT env (dns block)
• packages2.fhir.org
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java -jar /home/REDACTED/work/matchbox/matchbox/matchbox-server/target/surefire/surefirebooter-20251229173241584_89.jar /home/REDACTED/work/matchbox/matchbox/matchbox-server/target/surefire 2025-12-29T17-31-28_982-jvmRun1 surefire-20251229173241584_87tmp surefire_1-20251229173241584_88tmp 4/bin/env 0 -j ACCEPT env (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)