fix(ci): use npm to install opencode-ai CLI instead of install.sh

The @opencode-ai/sdk spawns 'opencode serve' internally, which requires
the actual opencode CLI binary to be installed. Our install.sh only
installs agents/commands/tools, not the CLI.

Changes:
- Install CLI via 'npm install -g opencode-ai' (the real CLI)
- Then install our agents via 'bash install.sh essential'
- Remove unnecessary PATH manipulation (npm -g handles this)

.github/workflows/test-agents.yml

@@ -28,17 +28,19 @@ jobs:
           cache: 'npm'
           cache-dependency-path: 'evals/framework/package-lock.json'
       
+      # Install the OpenCode CLI (from opencode.ai, NOT our install.sh)
+      # Our install.sh only installs agents/commands/tools, not the CLI binary
+      # The @opencode-ai/sdk spawns `opencode serve` internally, so CLI is required
       - name: Install OpenCode CLI
         run: |
-          bash install.sh
+          npm install -g opencode-ai
-          echo "$HOME/.opencode/bin" >> $GITHUB_PATH
-      
-      - name: Verify OpenCode installation
-        run: |
-          export PATH="$HOME/.opencode/bin:$PATH"
           which opencode
           opencode --version
       
+      # Install our OpenAgents components (agents, commands, tools)
+      - name: Install OpenAgents Components
+        run: bash install.sh essential --install-dir .opencode
+      
       - name: Install dependencies
         working-directory: evals/framework
         run: npm install
@@ -48,9 +50,7 @@ jobs:
         run: npm run build
       
       - name: Run OpenAgent smoke test
-        run: |
+        run: npm run test:ci:openagent
-          export PATH="$HOME/.opencode/bin:$PATH"
-          npm run test:ci:openagent
         env:
           CI: true
       
@@ -78,17 +78,19 @@ jobs:
           cache: 'npm'
           cache-dependency-path: 'evals/framework/package-lock.json'
       
+      # Install the OpenCode CLI (from opencode.ai, NOT our install.sh)
+      # Our install.sh only installs agents/commands/tools, not the CLI binary
+      # The @opencode-ai/sdk spawns `opencode serve` internally, so CLI is required
       - name: Install OpenCode CLI
         run: |
-          bash install.sh
+          npm install -g opencode-ai
-          echo "$HOME/.opencode/bin" >> $GITHUB_PATH
-      
-      - name: Verify OpenCode installation
-        run: |
-          export PATH="$HOME/.opencode/bin:$PATH"
           which opencode
           opencode --version
       
+      # Install our OpenAgents components (agents, commands, tools)
+      - name: Install OpenAgents Components
+        run: bash install.sh essential --install-dir .opencode
+      
       - name: Install dependencies
         working-directory: evals/framework
         run: npm install
@@ -98,9 +100,7 @@ jobs:
         run: npm run build
       
       - name: Run OpenCoder smoke test
-        run: |
+        run: npm run test:ci:opencoder
-          export PATH="$HOME/.opencode/bin:$PATH"
-          npm run test:ci:opencoder
         env:
           CI: true