perf: optimize V8 engine by eliminating redundant instantiation (#70)

* Adds benchmarks
* Updates docs

Author: ammario

.claude/commands/pr-submit.md

@@ -0,0 +1,21 @@
+Create a PR for the existing branch.
+
+Keep the PR title and body concise. Use the following title prefixes:
+
+- `fix:` for production code bug fixes
+- `perf:` for production code performance improvements
+- `feat:` for new features
+- `docs:` for documentation improvements (including README.md and CLAUDE.md)
+- `ci:` for CI improvements
+
+based on what best describes the changes.
+
+Avoid extraneous emphasis and emojis in the PR body. It should be factual and neutral.
+
+Consider at least:
+
+- Background (if any)
+- If fixing bugs, reproduction steps
+- Changes to the UX surface area
+- Testing approach
+- Acknowledged but intentionally ignored issues

.github/workflows/benchmark.yml

@@ -0,0 +1,49 @@
+name: Benchmarks
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [main]
+    paths:
+      - 'src/rules/**'
+      - 'benches/**'
+      - '.github/workflows/benchmark.yml'
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  benchmark:
+    runs-on: ubuntu-latest-8-cores
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: stable
+    
+    - name: Setup Rust cache
+      uses: Swatinem/rust-cache@v2
+      with:
+        shared-key: ${{ runner.os }}
+        # Share cache with other Linux workflows
+        cache-on-failure: true
+        # Cache benchmark-specific dependencies
+        cache-targets: true
+        cache-all-crates: true
+    
+    - name: Build benchmarks first (populates cache)
+      run: cargo build --release --bench rule_engines
+    
+    - name: Run benchmarks
+      run: cargo bench --bench rule_engines
+    
+    - name: Upload benchmark results
+      uses: actions/upload-artifact@v4
+      with:
+        name: benchmark-results
+        path: target/criterion/
+        retention-days: 30

.gitignore

@@ -5,4 +5,5 @@ CLAUDE.local.md
 artifacts/
 book
 test-build
-mermaid*.js
+mermaid*.js
+*.pb.gz