fix(agentrun): read sandbox status from data payload

[guslegend0510]

Summary

• Read AgentRun sandbox readiness from data.status before falling back to legacy top-level status / state fields.
• Add regression tests for data.status priority and top-level state fallback.

Fixes #2215

Tests

• mvn -pl :agentscope-extensions-sandbox-agentrun -am -Dtest=AgentRunDataPlaneHttpTest test

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nsions/sandbox/agentrun/AgentRunDataPlaneHttp.java	80.00%	0 Missing and 1 partial ⚠️

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[AgentScopeJavaBot]

🤖 AI Review

This PR fixes how AgentRunDataPlaneHttp determines sandbox readiness during polling. The textStatus helper now reads data.status from the JSON response payload first, falling back to legacy top-level status / state fields. The change is minimal (+7 prod lines), well-scoped, and accompanied by regression tests covering all three lookup paths. The three-level fallback chain (data.status → status → state) is implemented cleanly, and Jackson's JsonNode.get(String) on non-Object nodes returns null safely. Test coverage is thorough with the extracted newHttp() helper improving readability.

[AgentScopeJavaBot]

🤖 AI Review

This PR fixes how AgentRunDataPlaneHttp determines sandbox readiness during polling. The textStatus helper now reads data.status from the JSON response payload first, falling back to legacy top-level status / state fields. The change is minimal (+7 prod lines), well-scoped, and accompanied by regression tests covering all three lookup paths. The three-level fallback chain (data.status → status → state) is implemented cleanly, and Jackson's JsonNode.get(String) on non-Object nodes returns null safely. Test coverage is thorough with the extracted newHttp() helper improving readability.