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Implements US-710: benchmark harness that measures per-request HTTP metrics (latency, DNS time, DB proxy time, response size) across WarpGrid test apps T1–T5, with p50/p95/p99 percentile breakdowns. New files: - test-infra/bench-harness/bench-harness.sh — main harness (sequential + concurrent requests) - test-infra/bench-harness/bench-harness.test.sh — 63 TDD tests - test-infra/bench-harness/lib/percentile.sh — percentile computation library - scripts/compare-perf.sh — regression detection (>20% p95 triggers warning) Quality gate: shim overhead < 10% vs direct connection. All arithmetic uses awk (no bc dependency). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add 3 tests covering critical paths not previously exercised: - Quality gate boundary at 9.9% (just below 10% threshold) - Unknown CLI option rejection (exit code 1) - compare-perf.sh invalid JSON detection (exit code 2) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Implements US-710: Cross-domain performance baseline (#94).
test-infra/bench-harness/bench-harness.sh) — sends 100 sequential + 100 concurrent HTTP requests per test app (T1–T5), collects per-request metrics viacurl -w(latency, DNS, DB proxy time, response size), computes p50/p95/p99 percentile breakdowns, and outputs structured JSON totest-results/performance-baseline.jsontest-infra/bench-harness/lib/percentile.sh) — nearest-rank percentile computation and stats aggregation using pure bash + awkscripts/compare-perf.sh) — diffs two baseline JSON files, outputs formatted comparison table, exits with warning on >20% p95 regression (configurable via--threshold)Test plan
bench-harness.test.shCloses #94
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