Add reproduce-issue agent (#1497)

.github/workflows/reproduce-issue.yml

@@ -0,0 +1,43 @@
+name: reproduce-issue
+
+on:
+  issues:
+    types: [labeled]
+
+concurrency:
+  group: reproduce-issue-${{ github.event.issue.number }}
+  cancel-in-progress: true
+
+jobs:
+  reproduce:
+    if: github.event.label.name == 'bug'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
+
+      - name: Install opencode
+        run: curl -fsSL https://opencode.ai/install | bash
+
+      - name: Reproduce issue
+        env:
+          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ISSUE_URL: ${{ github.event.issue.html_url }}
+          ISSUE_NUMBER: ${{ github.event.issue.number }}
+          ISSUE_TITLE: ${{ github.event.issue.title }}
+          ISSUE_BODY: ${{ github.event.issue.body }}
+        run: |
+          opencode run --agent reproduce-issue "An issue in the OpenChamber repository has been labeled as a bug and needs reproduction. Reproduce it.
+
+          Issue: $ISSUE_URL
+
+          Title: $ISSUE_TITLE
+
+          $ISSUE_BODY"