fix(ingest): rank gen_ai.conversation.id before session.id for OpenInference-style vendors - #1177

🟢 Confidence 4/5 · likely safe to merge
A data-list reorder confined to apps/ingest/src/ai_session.rs, with the new test exercising both-keys and session-only inputs for every affected vendor.
_{quality 100/100 · no findings · tests covered · risk medium}

Ranks gen_ai.conversation.id ahead of bare session.id in the session-key list of the OpenInference-style vendors, keeping claude_agent_sdk and openrouter on session.id and LangSmith's thread first for langchain. The reorder is confined to the key tables and their test; safe to merge.

• CONVERSATION_THEN_SESSION_ID puts gen_ai.conversation.id before session.id
• dspy, agno, crewai, smolagents, strands, openinference-openai, llamaindex, haystack-OI and openai_agents_sdk use it
• langchain keeps langsmith.metadata.thread_id first, then the conversation id, then session.id

_{5ffc5df · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}