[ci] drop Node 16.x support (EOL since Sep 2023, required for typescript-eslint v8)

Author: mheadd

.github/workflows/ci-cd.yml

@@ -26,7 +26,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x]
 
     steps:
     - name: Checkout code
@@ -45,9 +45,7 @@ jobs:
       run: |
         echo "Current npm version: $(npm --version)"
         echo "Attempting to update npm..."
-        if [[ "${{ matrix.node-version }}" == "16.x" ]]; then
-          npm install -g npm@8 || echo "Failed to update npm, continuing with existing version"
-        elif [[ "${{ matrix.node-version }}" == "18.x" ]]; then
+        if [[ "${{ matrix.node-version }}" == "18.x" ]]; then
           npm install -g npm@10 || echo "Failed to update npm, continuing with existing version"
         else
           npm install -g npm@latest || echo "Failed to update npm, continuing with existing version"

.github/workflows/test-branch.yml

@@ -31,7 +31,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x]
 
     steps:
     - name: Checkout specified branch
@@ -49,9 +49,7 @@ jobs:
       run: |
         echo "Current npm version: $(npm --version)"
         echo "Attempting to update npm..."
-        if [[ "${{ matrix.node-version }}" == "16.x" ]]; then
-          npm install -g npm@8 || echo "Failed to update npm, continuing with existing version"
-        elif [[ "${{ matrix.node-version }}" == "18.x" ]]; then
+        if [[ "${{ matrix.node-version }}" == "18.x" ]]; then
           npm install -g npm@10 || echo "Failed to update npm, continuing with existing version"
         else
           npm install -g npm@latest || echo "Failed to update npm, continuing with existing version"

.github/workflows/test-pr-command.yml

@@ -28,7 +28,7 @@ jobs:
     
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x]
 
     steps:
     - name: React to comment
@@ -70,9 +70,7 @@ jobs:
       run: |
         echo "Current npm version: $(npm --version)"
         echo "Attempting to update npm..."
-        if [[ "${{ matrix.node-version }}" == "16.x" ]]; then
-          npm install -g npm@8 || echo "Failed to update npm, continuing with existing version"
-        elif [[ "${{ matrix.node-version }}" == "18.x" ]]; then
+        if [[ "${{ matrix.node-version }}" == "18.x" ]]; then
           npm install -g npm@10 || echo "Failed to update npm, continuing with existing version"
         else
           npm install -g npm@latest || echo "Failed to update npm, continuing with existing version"

AGENTS.md

@@ -8,7 +8,7 @@ The USAi API is a TypeScript/Node.js client library that provides an OpenAI-comp
 
 ### Key Technologies
 - TypeScript with strict mode
-- Node.js (16.x, 18.x, 20.x support)
+- Node.js (18.x, 20.x support)
 - Jest for testing
 - ESLint + Prettier for code quality
 - OpenAI-compatible API design patterns