feat: Update OpenAI graph runner to return AgentGraphRunnerResult with GraphMetrics

[jsonbailey]

Summary

• Removes all direct LaunchDarkly tracker calls from OpenAIAgentGraphRunner
• Introduces _NodeMetricsAccumulator — a lightweight per-node metrics collector replacing LDAIConfigTracker inside the runner
• Runner now returns AgentGraphRunnerResult with populated GraphMetrics (path, duration_ms, usage, node_metrics)
• Graph-level and per-node tracking events are emitted by ManagedAgentGraph._flush_graph_tracking() from the result metrics
• ManagedAgentGraph._flush_graph_tracking() extended to drive per-node tracking from result.metrics.node_metrics using graph node tracker factories
• Integration tests updated to exercise the full ManagedAgentGraph.run() pipeline (tracking events now come from the managed layer)
• Handoff-level track_handoff_success() calls removed (per spec: path field is sufficient; handoffs are not in GraphMetrics)

Depends on

• feat: Graph tracking refactor — ManagedAgentGraph drives tracking for new runner shape #154 (PR 11 — graph tracking refactor, bridge pattern for old/new runner shapes)

Test plan

• All existing tests pass (uv run pytest packages/ai-providers/server-ai-openai/tests/)
• test_openai_agent_graph_runner.py: runner returns new shape, no tracker created
• test_tracking_openai_agents.py: graph-level and per-node events emitted through managed layer

🤖 Generated with Claude Code

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Note

Medium Risk
Changes the runner result shape and shifts LaunchDarkly event emission from the OpenAI runner to ManagedAgentGraph, which could affect downstream integrations and metric correctness if node/path/usage attribution is wrong.

Overview
OpenAIAgentGraphRunner now returns AgentGraphRunnerResult with GraphMetrics (path, duration_ms, usage, and per-node node_metrics) and removes all direct LaunchDarkly tracker calls, including handoff tracking.

Per-node durations/usage/tool calls are accumulated inside the runner (_node_metrics) during handoffs and final segment flush, and the integration path is updated so ManagedAgentGraph emits graph + node tracking events by consuming result.metrics.node_metrics and creating node trackers on demand.

Tests are updated to assert the new result fields, ensure trackers are no longer created/called by the runner, and to run tracking assertions through ManagedAgentGraph.run() (including failure cases and multi-node runs).

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