fix: sanitize agent names for OpenAI models

[RachitJava]

AgentScope-Java Version

[The version of AgentScope-Java you are working on, e.g. 1.0.12, check your pom.xml dependency version or run mvn dependency:tree | grep agentscope-parent:pom(only mac/linux)]

Description

[Please describe the background, purpose, changes made, and how to test this PR]

Checklist

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• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
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[RachitJava]

Problem
The OpenAI Chat Completions API enforces strict validation on the name field of messages, requiring it to match the regex pattern ^[a-zA-Z0-9_-]+$.
If an agent is initialized in AgentScope with a display name that contains spaces or special characters (e.g. "My Agent"), sending this name directly in the message payload causes the OpenAI API to return a 400 Bad Request error.
This causes the entire agent execution to fail unexpectedly when interacting with OpenAI models.

Solution
Added a sanitizeName helper method in OpenAIMessageConverter.java that replaces any characters outside of [a-zA-Z0-9_-] with an underscore (_).
Updated convertUserMessage and convertAssistantMessage to pass the msg.getName() through the sanitizeName() method before assigning it to the OpenAIMessage.Builder.
Added a new unit test testMessageWithSanitizedName in OpenAIMessageConverterTest.java to verify that spaces and special characters in agent names are safely escaped.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...model/openai/formatter/OpenAIMessageConverter.java	60.00%	1 Missing and 1 partial ⚠️

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[oss-maintainer]

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[jujn]

fixed in: #2346