feat: OpenTelemetry export and CostTracker (M21)#387
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Add optional OTLP trace export (feature-gated behind `otel`) with tracing-opentelemetry layer and spans for LLM calls and tool executions. Add CostTracker with per-model token pricing, daily budget limits, and automatic UTC midnight reset. Integrated into agent loop with budget check before each LLM request. Config sections: [observability] and [cost] in default.toml.
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Summary
otelfeature flag withtracing-opentelemetrylayer, spans for LLM calls (llm_call) and tool executions (tool_exec)CostTrackerwith per-model token pricing, daily budget limits (UTC midnight reset), integrated into agent loop with pre-request budget check[observability]and[cost]indefault.tomlCloses #377, closes #378, closes #366
Test plan
otelfeature builds clean (cargo build --features otel)