fix: handle event encoding errors

[tcheeric]

Summary

• add explicit event serialization error handling with new EventEncodingException
• wrap event encoding in message encoders to surface failures
• add test for serialization failure scenarios

Testing

• mvn -q verify (fails: Could not find a valid Docker environment)

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https://chatgpt.com/codex/tasks/task_b_68a732af0b6c8331a84573f43730c08c

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 13.33333% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../event/message/CanonicalAuthenticationMessage.java	0.00%	7 Missing ⚠️
...rc/main/java/nostr/event/message/EventMessage.java	0.00%	5 Missing ⚠️
.../java/nostr/event/json/codec/BaseEventEncoder.java	66.66%	1 Missing ⚠️

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