feat(agentscope): Add ReAct Span Support

[sipercai]

Description

Add react step span instrumentation for AgentScope ReAct agents. Each ReAct iteration (reasoning → acting) is wrapped in a dedicated span for trace visualization.
Implemented via AgentScope's built-in instance-level hook system, no internal monkey-patching needed.

Fixes #137

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

5 new VCR test cases covering: text-only response, single/multi tool calls, exception handling, hook cleanup.
Verified with live traffic against CMS 2.0 OTLP backend.

• TestReactStepSpan — 5 tests passed

Does This PR Require a Core Repo Change?

• Yes. — feat(genai-util): Add Entry Span and ReAct Span Support #135 (already merged)

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[123liuziming]

@copilot review the PR.

[Copilot]

@123liuziming I've opened a new pull request, #146, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

Pull request overview

Adds ReAct “react step” span instrumentation for AgentScope ReAct agents to improve trace visualization per reasoning→acting iteration, implemented via instance-level hooks.

Changes:

• Introduce per-iteration react step span lifecycle management via AgentScope instance hooks.
• Add VCR-backed test coverage for text-only, tool-call, multi-tool, error, and hook-cleanup scenarios.
• Update docs/changelog to describe the new ReAct step spans.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
instrumentation-loongsuite/loongsuite-instrumentation-agentscope/src/opentelemetry/instrumentation/agentscope/_wrapper.py	Adds hook-based ReAct step span tracking and cleanup around agent calls.
instrumentation-loongsuite/loongsuite-instrumentation-agentscope/tests/test_agent.py	Adds VCR tests validating step span creation, attributes, error status, and hook cleanup.
instrumentation-loongsuite/loongsuite-instrumentation-agentscope/tests/conftest.py	Forces skip_dep_check=True when instrumenting during tests.
instrumentation-loongsuite/loongsuite-instrumentation-agentscope/tests/cassettes/*.yaml	Adds new VCR recordings for the new ReAct step span tests.
instrumentation-loongsuite/loongsuite-instrumentation-agentscope/README.md	Documents ReAct step span support.
instrumentation-loongsuite/loongsuite-instrumentation-agentscope/CHANGELOG.md	Adds changelog entry for ReAct step span instrumentation.

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