Summary

• Remove redundant catch-and-rethrow blocks flagged by static analysis.
• Reuse a single HttpClient instance in Nip05Validator instead of per-call creation.
• Chore: bump version to 0.2.4 (x.y.z).

Changes

• F:nostr-java-event/src/main/java/nostr/event/impl/CreateOrUpdateStallEvent.java†L49-L62: remove catch (AssertionError e) { throw e; }; preserve wrapping of non-assertion exceptions.
• F:nostr-java-event/src/main/java/nostr/event/impl/MerchantEvent.java†L43-L56: remove catch (AssertionError e) { throw e; }; preserve wrapping of non-assertion exceptions.
• F:nostr-java-util/src/main/java/nostr/util/validator/Nip05Validator.java†L32-L49,L82: add cached HttpClient and client() accessor; replace per-call HttpClient.newHttpClient() with reuse.
• F:pom.xml†L6,L77: bump project + property version to 0.2.4.
• F:nostr-java-*/pom.xml: bump module versions to 0.2.4.

Testing

• ✅ mvn -q -DskipITs=false verify
  • Passed locally. Notable logs (tests ran, no failures):
    • Spring WebSocket client tests executed with retries and expected exceptions in tests.
    • Testcontainers pulled and started scsibug/nostr-rs-relay:latest containers successfully.

Network Access

• No blocked domains encountered. Maven dependencies and Testcontainers images resolved successfully.

Notes

• SLF4J no-provider warnings are informational and unchanged by this PR.
• Mockito agent warnings are also informational and unrelated to these changes.

Protocol Compliance

• No event schema or protocol behavior changed. Validations remain aligned with NIP-15 content expectations (stall and merchant entity checks remain intact).