style: simplify generics in NIP01 builder

[tcheeric]

Summary

Related issue: #____

What changed?

• Replace explicit generic type arguments in NIP01EventBuilder factory invocations with the diamond operator for clarity.

BREAKING

Review focus

• Ensure the type inference changes keep the same runtime behavior.

Checklist

• Scope ≤ 300 lines (or split/stack)
• Title is verb + object (e.g., “Refactor auth middleware to async”)
• Description links the issue and answers “why now?”
• BREAKING flagged if needed
• Tests/docs updated (if relevant)

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Testing

mvn -q verify
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Non-resolvable import POM: The following artifacts could not be resolved: xyz.tcheeric:nostr-java-bom:pom:1.1.8 (absent): Could not find artifact xyz.tcheeric:nostr-java-bom:pom:1.1.8 in central (https://repo.maven.apache.org/maven2) @ line 99, column 25
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project xyz.tcheeric:nostr-java:1.0.0 (/workspace/nostr-java/pom.xml) has 1 error
[ERROR]     Non-resolvable import POM: The following artifacts could not be resolved: xyz.tcheeric:nostr-java-bom:pom:1.1.8 (absent): Could not find artifact xyz.tcheeric:nostr-java-bom:pom:1.1.8 in central (https://repo.maven.apache.org/maven2) @ line 99, column 25 -> [Help 2]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

Known issues / limitations

• Build currently fails because xyz.tcheeric:nostr-java-bom:1.1.8 is unavailable from Maven Central.

Network Access

• No blocked domains encountered; Maven Central responded but lacked the requested artifact.

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https://chatgpt.com/codex/tasks/task_b_68ed9365c9cc833195aab256adeae129