feat: add comment-reaction action for responding to user comments

- Create new composite action for adding emoji reactions to GitHub comments
- Support both PR review comments and issue comments
- Configurable reaction type with sensible default (eyes)
- Full TypeScript implementation with type safety
- Comprehensive error handling and logging
- Includes README with usage examples and documentation

Author: Tulga Tsogtgerel

comment-reaction/README.md

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+# Comment Reaction Action
+
+A GitHub Action that adds emoji reactions to comments on pull requests and issues.
+
+## Features
+
+- ✅ React to PR review comments
+- ✅ React to issue comments
+- ✅ Support for all GitHub reaction types
+- ✅ TypeScript implementation with full type safety
+- ✅ Detailed error messages and logging
+
+## Usage
+
+### Basic Example
+
+```yaml
+- name: React to comment with eyes
+  uses: augmentcode/augment-agent/comment-reaction@feature/comment-reaction-action
+  with:
+    github_token: ${{ secrets.GITHUB_TOKEN }}
+    comment_id: ${{ github.event.comment.id }}
+    event_name: ${{ github.event_name }}
+```
+
+### Custom Reaction
+
+```yaml
+- name: React to comment with rocket
+  uses: augmentcode/augment-agent/comment-reaction@feature/comment-reaction-action
+  with:
+    github_token: ${{ secrets.GITHUB_TOKEN }}
+    comment_id: ${{ github.event.comment.id }}
+    event_name: ${{ github.event_name }}
+    reaction: rocket
+```
+
+### Complete Workflow Example
+
+```yaml
+name: React to Comments
+on:
+  pull_request_review_comment:
+    types: [created]
+  issue_comment:
+    types: [created]
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  react:
+    runs-on: ubuntu-latest
+    steps:
+      - name: React to comment
+        uses: augmentcode/augment-agent/comment-reaction@feature/comment-reaction-action
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          comment_id: ${{ github.event.comment.id }}
+          event_name: ${{ github.event_name }}
+          reaction: eyes
+```
+
+## Inputs
+
+| Input | Description | Required | Default |
+|-------|-------------|----------|---------|
+| `github_token` | GitHub token for API access. Must have permissions to add reactions. | Yes | - |
+| `comment_id` | The ID of the comment to react to | Yes | - |
+| `event_name` | The GitHub event name (`pull_request_review_comment` or `issue_comment`) | Yes | - |
+| `reaction` | The reaction type to add | No | `eyes` |
+
+## Supported Reactions
+
+- `+1` - 👍
+- `-1` - 👎
+- `laugh` - 😄
+- `confused` - 😕
+- `heart` - ❤️
+- `hooray` - 🎉
+- `rocket` - 🚀
+- `eyes` - 👀
+
+## Outputs
+
+| Output | Description |
+|--------|-------------|
+| `success` | Whether the reaction was successfully added (`true` or `false`) |
+
+## Permissions
+
+The action requires the following permissions:
+
+```yaml
+permissions:
+  pull-requests: write  # For PR review comments
+  issues: write         # For issue comments
+```
+
+## License
+
+MIT
+

comment-reaction/action.yml

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+name: "Comment Reaction"
+description: "React to GitHub comments with emoji reactions"
+author: "Augment Code"
+branding:
+  icon: "eye"
+  color: "blue"
+
+inputs:
+  github_token:
+    description: "GitHub token for API access. Must have permissions to add reactions."
+    required: true
+  comment_id:
+    description: "The ID of the comment to react to"
+    required: true
+  event_name:
+    description: "The GitHub event name (pull_request_review_comment or issue_comment)"
+    required: true
+  reaction:
+    description: "The reaction type to add (e.g., eyes, rocket, heart, hooray, confused, +1, -1, laugh)"
+    required: false
+    default: "eyes"
+
+outputs:
+  success:
+    description: "Whether the reaction was successfully added"
+    value: ${{ steps.react.outputs.success }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Setup Node
+      uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+      with:
+        node-version: 22
+    - name: Install Action Dependencies
+      run: npm install --production
+      shell: bash
+      working-directory: ${{ github.action_path }}
+    - name: React to Comment
+      id: react
+      run: npx tsx ${{ github.action_path }}/src/index.ts
+      shell: bash
+      env:
+        INPUT_GITHUB_TOKEN: ${{ inputs.github_token }}
+        INPUT_COMMENT_ID: ${{ inputs.comment_id }}
+        INPUT_EVENT_NAME: ${{ inputs.event_name }}
+        INPUT_REACTION: ${{ inputs.reaction }}
+        GITHUB_REPOSITORY: ${{ github.repository }}
+