fix(telemetry): use max instead of sum for streaming token usage aggregation

[LearningGp]

AgentScope-Java Version

1.0.11

Description

use max instead of sum for streaming token usage aggregation

fix #1104

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[Copilot]

Pull request overview

Adjusts telemetry aggregation for streaming ChatResponse so that token usage is treated as cumulative across chunks (taking the maximum observed value) rather than summing per-chunk values, which can overcount for providers that report cumulative totals.

Changes:

• Update StreamChatResponseAggregator to aggregate inputTokens/outputTokens via Math.max(...) instead of summation.
• Add unit tests covering cumulative-usage (max) behavior and “usage only in last chunk” behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
agentscope-extensions/agentscope-extensions-studio/src/main/java/io/agentscope/core/tracing/telemetry/StreamChatResponseAggregator.java	Switch token usage aggregation from sum to max for streaming telemetry.
agentscope-extensions/agentscope-extensions-studio/src/test/java/io/agentscope/core/tracing/telemetry/StreamChatResponseAggregatorTest.java	Add tests validating the new token usage aggregation behavior.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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