fix(agent-sessions): treat the GenAI memory operations as known ops - #1142

🟡 Confidence 3/5 · needs attention
The summary-vs-page mismatch is fixed and tested, but the open finding that a memory span without gen_ai.operation.name still opens a turn stands unchanged in findAnchors.
_{quality 90/100 · 1 warning · tests covered · risk medium}

This head adds AI_MEMORY_OPERATIONS to the summary query's unstamped llm-call exclusion, rewrites the ai_trace_index catalog notes around the ingest gateway's maple_ai.* stamps, and pins the change with a SQL test. The changed files are safe to merge; one earlier concern still stands.

• aiSessionSummaryQuery excludes AI_MEMORY_OPERATIONS from the unstamped llm-call fallback
• ai_trace_index catalog notes now describe the gateway's maple_ai.* stamps
• New test pins memory ops out of the summary's llm-call rule

Still open from earlier reviews

• 🟠 Warning · F1 · Memory span with no gen_ai.operation.name still opens a turn · packages/agent-sessions/src/session-turns.ts:425

Fixed since the last review

• ✅ F3 · Memory ops read as agent on the page but stay llm calls in the session summary

_{f6836b9 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}