feat(examples): update healthcare-assistant to splunk-ao 0.3.0 (SAO-16437) - #240

Summary

• Pin splunk-ao>=0.3.0 in requirements.txt
• Update k8s.yaml image to ghcr.io/splunk/healthcare-assistant-sao:0.3.0 (multi-platform linux/amd64 + linux/arm64)
• Fix trace flush: add flush_on_chain_end=True to SplunkAOAsyncCallback so spans export immediately after each turn
• Fix trace isolation: pass only the latest user message per turn (not full history) to keep each trace as a clean input/output pair
• Fix hallucination session: apply external_session_id to logger so hallucination demo appears in the same session as chat traces
• Build LangGraph graph once per agent instance instead of per query

Validation

• Tested locally with ghcr.io/splunk/healthcare-assistant-sao:0.3.0 against lab0
• Traces appear correctly in erden-framework-testing / healthcare-docker-local
• Patient lookup (tool call), RAG retrieval, and hallucination demo all validated
• Session grouping confirmed — hallucination trace shares session ID with chat traces
• Multi-platform image confirmed: linux/amd64 + linux/arm64

Test plan

• Deploy to k8s with updated image tag and confirm pod starts cleanly
• Send a query and verify trace appears on lab0 under the configured project/agent stream
• Trigger hallucination demo and confirm it appears in the same session

Jira: SAO-16437

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