chore: drop Node 20 support (EOL April 2026) (#97)

Node 20 reached end-of-life in April 2026. Bump the engines field to
>=22 and remove Node 20 from the CI test matrix.

Closes #65

Co-authored-by: Claude <noreply@anthropic.com>

Author: zeevdr

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
 # CI pipeline for the OpenDecree TypeScript SDK.
 #
-# Jobs: lint, typecheck, test (matrix: Node 20/22/24), examples, integration → check (alls-green gate)
+# Jobs: lint, typecheck, test (matrix: Node 22/24), examples, integration → check (alls-green gate)
 # The check job aggregates all results for branch protection.
 #
 # The first job defines YAML anchors (&checkout, &setup-node-22, &install)
@@ -59,7 +59,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: ["20", "22", "24"]
+        node-version: ["22", "24"]
     steps:
       - *checkout
       - name: Set up Node.js ${{ matrix.node-version }}

README.md

@@ -14,7 +14,7 @@ TypeScript SDK for [OpenDecree](https://github.com/opendecree/decree) -- schema-
 
 ## Requirements
 
-- Node.js **≥ 20** (ESM-only package — CommonJS is not supported)
+- Node.js **≥ 22** (ESM-only package — CommonJS is not supported)
 
 ## Install
 
@@ -105,7 +105,7 @@ Runnable examples in the [`examples/`](examples/) directory:
 
 ## Requirements
 
-- Node.js 20+
+- Node.js 22+
 - A running OpenDecree server (v0.8.0 – v0.x, pre-1.0)
 
 ## Questions?

package.json

@@ -53,7 +53,7 @@
     "url": "https://github.com/opendecree/decree-typescript/issues"
   },
   "engines": {
-    "node": ">=20"
+    "node": ">=22"
   },
   "dependencies": {
     "@grpc/grpc-js": "^1.12.0"