Add agent-level permissions with whitelist/blacklist support (#1862)

.github/workflows/duplicate-issues.yml

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+name: Duplicate Issue Detection
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  check-duplicates:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Install opencode
+        run: curl -fsSL https://opencode.ai/install | bash
+
+      - name: Check for duplicate issues
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          opencode run --agent github -m anthropic/claude-sonnet-4-20250514 "A new issue has been created: '${{ github.event.issue.title }}'
+
+          Issue body:
+          ${{ github.event.issue.body }}
+
+          Please search through existing issues in this repository to find any potential duplicates of this new issue. Consider:
+          1. Similar titles or descriptions
+          2. Same error messages or symptoms
+          3. Related functionality or components
+          4. Similar feature requests
+
+          If you find any potential duplicates, please comment on the new issue with:
+          - A brief explanation of why it might be a duplicate
+          - Links to the potentially duplicate issues
+          - A suggestion to check those issues first
+
+          Use this format for the comment:
+          '👋 This issue might be a duplicate of existing issues. Please check:
+          - #[issue_number]: [brief description of similarity]
+
+          If none of these address your specific case, please let us know how this issue differs.'
+
+          If no clear duplicates are found, do not comment."

.github/workflows/guidelines-check.yml

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+name: Guidelines Check
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  check-guidelines:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Install opencode
+        run: curl -fsSL https://opencode.ai/install | bash
+
+      - name: Check PR guidelines compliance
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          opencode run --agent github -m anthropic/claude-sonnet-4-20250514 "A new pull request has been created: '${{ github.event.pull_request.title }}'
+
+          PR description:
+          ${{ github.event.pull_request.body }}
+
+          Please check all the code changes in this pull request against the guidelines in AGENTS.md file in this repository.
+
+          For each violation you find, create a file comment using the gh CLI. Use this exact format for each violation:
+
+          \`\`\`bash
+          gh pr review ${{ github.event.pull_request.number }} --comment-body 'This violates the AGENTS.md guideline: [specific rule]. Consider: [suggestion]' --file 'path/to/file.ts' --line [line_number]
+          \`\`\`
+
+          When possible, also submit code change suggestions using:
+
+          \`\`\`bash
+          gh pr review ${{ github.event.pull_request.number }} --comment-body 'Suggested fix for AGENTS.md guideline violation:' --file 'path/to/file.ts' --line [line_number] --body '```suggestion
+          [corrected code here]
+          ```'
+          \`\`\`
+
+          Only create comments for actual violations. If the code follows all guidelines, don't run any gh commands."