chore: WIP pre-implement cycle 14 baseline

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/06_metrics/perf_2026-06-26_cycle13.md

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+# Performance Report — Cycle 13
+
+**Date**: 2026-06-26
+**Cycle**: 13 (AZ-1126 capturedAt DateTimeOffset)
+**Runner**: `scripts/run-performance-tests.sh` (default: `PERF_REPEAT_COUNT=20`, `PERF_UAV_BATCH_SIZE=10`, `PERF_PT10_SLOW_MS=50`)
+**Stack**: `docker compose -f docker-compose.yml -f docker-compose.perf.yml up -d --build`
+**API_URL**: `https://localhost:18980`
+**Verdict**: **PASS** (11/11 thresholds; exit 0)
+
+## Notes
+
+First perf attempt failed at PT-01 (exit 7) because the perf stack was not running — resolved by starting the compose overlay before re-run.
+
+## REST scenarios (PT-01..PT-08)
+
+| Scenario | Result | Key metric |
+|----------|--------|------------|
+| PT-01 cold tile | Pass | 1519 ms |
+| PT-02 cached tile | Pass | 230 ms |
+| PT-03 region 200m | Pass | 2433 ms |
+| PT-04 region 500m stitch | Pass | 2158 ms |
+| PT-05 concurrent regions | Pass | 2378 ms |
+| PT-06 route create | Pass | 203 ms |
+| PT-07 cold/warm | Pass | warm p95 54 ms vs cold 2148 ms |
+| PT-08 UAV batch | Pass | batch p95 225 ms |
+
+AZ-1126 does not change perf probe payloads (PT-08 still uses offset-aware `capturedAt` from fixture generator).
+
+## PT-10 (gRPC stream)
+
+| Metric | p50 | p95 | Threshold | Verdict |
+|--------|-----|-----|-----------|---------|
+| first_batch_ms | 43 ms | 63 ms | ≤ 30000 ms | Pass |
+| total_stream_ms | 43 ms | 64 ms | ≤ 120000 ms | Pass |
+| slow-consumer | — | — | completes without DeliveryError | Pass |
+
+Iteration 1 cold path ~3950 ms first batch (empty volume); iterations 2–20 warm cached.