chore: initialize autoresearch baseline

experiments/worklog.md

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+# Autoresearch Worklog: latency-p95-chat-completions
+
+## Session Summary
+- Objective: reduce end-to-end p95 latency for local `POST /v1/chat/completions`
+- Primary metric: `p95_ms` (lower is better)
+- Secondary metrics: `p50_ms`, `mean_ms`, `completion_tps_mean`, `success_count`
+- Benchmark harness: `./autoresearch.sh`
+
+## Key Insights
+- No experiment runs logged yet.
+
+## Next Ideas
+- Measure baseline first, then inspect the hottest latency contributors in prompt preparation, request handling, and session creation.