EPIC-07: Add CI perf regression and repro replay gates

.github/workflows/ci.yml

@@ -71,6 +71,10 @@ jobs:
       - name: Tests
         run: npm run test
 
+      - name: Repro replay fixtures (headless, explicit gate)
+        if: runner.os == 'Linux'
+        run: node --test --test-concurrency=1 packages/core/dist/repro/__tests__/replay.harness.test.js
+
       - name: Setup Rust (stable)
         uses: dtolnay/rust-toolchain@stable
 
@@ -152,6 +156,57 @@ jobs:
       - name: Terminal e2e (reduced)
         run: bun run test:e2e:reduced
 
+  perf-regression:
+    name: perf regression gate
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout (with submodules)
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+
+      - name: Install
+        run: npm ci
+
+      - name: Build packages
+        run: npm run build
+
+      - name: Build benchmark package
+        run: npx tsc -p packages/bench/tsconfig.json
+
+      - name: Run reduced benchmark suite
+        run: npm run bench:ci -- --output-dir .artifacts/bench/ci
+
+      - name: Compare reduced benchmark results against baseline
+        run: |
+          npm run bench:ci:compare -- \
+            --baseline benchmarks/ci-baseline/results.json \
+            --current .artifacts/bench/ci/results.json \
+            --config benchmarks/ci-baseline/config.json \
+            --report-json .artifacts/bench/ci/compare.json \
+            --report-md .artifacts/bench/ci/compare.md
+
+      - name: Upload perf regression artifacts
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: perf-regression-artifacts
+          if-no-files-found: warn
+          path: |
+            .artifacts/bench/ci/results.json
+            .artifacts/bench/ci/results.md
+            .artifacts/bench/ci/compare.json
+            .artifacts/bench/ci/compare.md
+            .artifacts/bench/ci/manifest.json
+            .artifacts/bench/ci/profile.json
+
   docs:
     name: docs
     runs-on: ubuntu-latest

benchmarks/ci-baseline/config.json

@@ -0,0 +1,110 @@
+{
+  "meta": {
+    "profilePath": "packages/bench/profiles/ci.json",
+    "baselinePolicy": "Update only on intentional perf shifts or deliberate threshold tuning. Prefer refreshing from CI perf-regression artifacts to stay host-class consistent.",
+    "baselineGenerationCommand": "Use perf-regression GitHub Actions artifacts (results.json/results.md) and copy into benchmarks/ci-baseline/",
+    "baselineSource": "GitHub Actions run 22054843644 / perf regression gate artifact",
+    "comparisonCommandTemplate": "npm run bench:ci:compare -- --current <run>/results.json --report-json <run>/compare.json --report-md <run>/compare.md",
+    "createdAt": "2026-02-16T08:10:03Z"
+  },
+  "requiredScenarios": [
+    {
+      "scenario": "terminal-rerender",
+      "framework": "rezi-native",
+      "params": {}
+    },
+    {
+      "scenario": "terminal-frame-fill",
+      "framework": "rezi-native",
+      "params": {
+        "rows": 40,
+        "cols": 120,
+        "dirtyLines": 1
+      }
+    },
+    {
+      "scenario": "terminal-frame-fill",
+      "framework": "rezi-native",
+      "params": {
+        "rows": 40,
+        "cols": 120,
+        "dirtyLines": 40
+      }
+    },
+    {
+      "scenario": "terminal-virtual-list",
+      "framework": "rezi-native",
+      "params": {
+        "items": 100000,
+        "viewport": 40
+      }
+    },
+    {
+      "scenario": "terminal-table",
+      "framework": "rezi-native",
+      "params": {
+        "rows": 40,
+        "cols": 8
+      }
+    }
+  ],
+  "metrics": {
+    "defaults": {
+      "timing.mean": {
+        "relativeRegression": 0.2,
+        "absoluteRegression": 0.03,
+        "severity": "hard",
+        "direction": "higher_is_worse"
+      },
+      "timing.p95": {
+        "relativeRegression": 0.35,
+        "absoluteRegression": 0.1,
+        "severity": "advisory",
+        "direction": "higher_is_worse"
+      }
+    },
+    "overrides": [
+      {
+        "match": {
+          "scenario": "terminal-frame-fill",
+          "framework": "rezi-native",
+          "params": {
+            "rows": 40,
+            "cols": 120,
+            "dirtyLines": 40
+          },
+          "metric": "timing.mean"
+        },
+        "rule": {
+          "relativeRegression": 0.22,
+          "absoluteRegression": 0.04
+        },
+        "reason": "Higher dirty-line density has slightly wider spread in CI."
+      },
+      {
+        "match": {
+          "scenario": "terminal-virtual-list",
+          "framework": "rezi-native",
+          "metric": "timing.mean"
+        },
+        "rule": {
+          "relativeRegression": 0.22,
+          "absoluteRegression": 0.06
+        },
+        "reason": "Large-list workload has greater host scheduler sensitivity."
+      },
+      {
+        "match": {
+          "scenario": "terminal-virtual-list",
+          "framework": "rezi-native",
+          "metric": "timing.p95"
+        },
+        "rule": {
+          "relativeRegression": 0.4,
+          "absoluteRegression": 0.12
+        },
+        "reason": "Tail latency is noisier for this scenario on shared CI hosts."
+      }
+    ]
+  }
+}