fix(agent-sessions): ingest detection and attribute decoding - #1127

Confidence 4/5 · likely safe to merge
The one place to watch is the merge-order gate: without #1121 the reclassified OpenInference OpenAI-Agents spans decode through the default GenAI integration.
_{quality 98/100 · 1 note · tests covered · risk medium}

The head commit narrows the custom-service Strands rule in apps/ingest/src/ai_session.rs to spans carrying gen_ai.event.start_time, closing the false-positive the bot raised on service-named scopes. The ai_session.rs delta reads correctly and is covered by tests; safe to merge, gated on #1121 per the PR body.

• detect_strands needs gen_ai.event.start_time for the service-named TS rule
• gen_ai_event_start_time evidence bit set from gen_ai.event.start_time
• Two tests cover the positive and the negative Strands cases

Still open from earlier reviews

• Note · F1 · anyValueJson emits map keys in insertion order, Rust sorts them · apps/cli/src/server/otlp/encode.ts:262

_{5f8fa10 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple to ask about one.}