Migrate healthcare-assistant 2-app-with-instrumentation from galileo to splunk-ao SDK

[etserend]

Summary

• Replace galileo SDK with splunk-ao across app code, k8s config, and workshop content pages
• splunk-ao is a 1:1 rebrand — same callback architecture, direct import path rename only
• Validated locally against lab0 (O11y Alpha) and Galileo staging with three-way trace comparison (galileo SDK / splunk-ao standalone / splunk-ao O11y)

Changes

• requirements.txt: galileo → splunk-ao
• setup_env.py: GALILEO_* → SPLUNK_AO_REALM / SPLUNK_AO_O11Y_TOKEN / SPLUNK_AO_PROJECT / SPLUNK_AO_AGENT_STREAM
• agent.py / agent-with-instrumentation.py: galileo_context → splunk_ao_context, GalileoAsyncCallback → SplunkAOAsyncCallback, log_stream= → agent_stream=
• helpers/hallucination_helpers.py: GalileoLogger → SplunkAOLogger
• app.py: session state keys renamed
• k8s.yaml: galileo-config → splunk-ao-config; single GALILEO_API_KEY secret → splunk-ao-secret with realm, o11y-token, o11y-api-token
• Workshop content pages: remove "Note about SDK" boxes, update kubectl commands, imports, and log output examples

Test plan

• Ran validate_traces.py — all 3 envs produced traces with correct RAG answers
• Confirmed span tree, token counts, and model badge in AO console (Galileo staging + O11y Alpha)

[dmitchsplunk]

Thank you for the PR but we can't make these changes until after the workshop is delivered at GSX on August 25th. Closing for now to ensure it doesn't get merged inadvertently.

cc @timhard-splunk @billg-splunk @rcastley

[etserend]

Sure, I've filed ticket for tracking purpose.

Thank you for the PR but we can't make these changes until after the workshop is delivered at GSX on August 25th. Closing for now to ensure it doesn't get merged inadvertently.

cc @timhard-splunk @billg-splunk @rcastley

[satish-m]

@dmitchsplunk sorry about this, we will make changes in a fork and can update here after the GSX. Have a great demo.
cc: @etserend