clean up comments

- Create new updateClaudeComment function in operations/comments
- Add comprehensive unit tests following image-downloader pattern
- Update MCP server to use extracted function
- Refactor update-comment-link.ts and update-with-branch.ts to eliminate duplication
- All tests passing (10 new tests for update-claude-comment)

Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com>

README.md

@@ -65,11 +65,6 @@ jobs:
           # trigger_phrase: "/claude"
           # Optional: add assignee trigger for issues
           # assignee_trigger: "claude"
-          # Optional: add custom environment variables (YAML format)
-          # claude_env: |
-          #   NODE_ENV: test
-          #   DEBUG: true
-          #   API_URL: https://api.example.com
 ```
 
 ## Inputs
@@ -90,7 +85,6 @@ jobs:
 | `mcp_config`          | Additional MCP configuration (JSON string) that merges with the built-in GitHub MCP servers                          | No       | ""        |
 | `assignee_trigger`    | The assignee username that triggers the action (e.g. @claude). Only used for issue assignment                        | No       | -         |
 | `trigger_phrase`      | The trigger phrase to look for in comments, issue/PR bodies, and issue titles                                        | No       | `@claude` |
-| `claude_env`          | Custom environment variables to pass to Claude Code execution (YAML format)                                          | No       | ""        |
 
 \*Required when using direct Anthropic API (default and when not using Bedrock or Vertex)
 
@@ -295,22 +289,6 @@ This action is built on top of [`anthropics/claude-code-base-action`](https://gi
 
 ## Advanced Configuration
 
-### Custom Environment Variables
-
-You can pass custom environment variables to Claude Code execution using the `claude_env` input. This is useful for CI/test setups that require specific environment variables:
-
-```yaml
-- uses: anthropics/claude-code-action@beta
-  with:
-    claude_env: |
-      NODE_ENV: test
-      CI: true
-      DATABASE_URL: postgres://test:test@localhost:5432/test_db
-    # ... other inputs
-```
-
-The `claude_env` input accepts YAML format where each line defines a key-value pair. These environment variables will be available to Claude Code during execution, allowing it to run tests, build processes, or other commands that depend on specific environment configurations.
-
 ### Custom Tools
 
 By default, Claude only has access to:

action.yml

@@ -41,8 +41,6 @@ inputs:
     default: ""
   mcp_config:
     description: "Additional MCP configuration (JSON string) that merges with the built-in GitHub MCP servers"
-  claude_env:
-    description: "Custom environment variables to pass to Claude Code execution (YAML format)"
     required: false
     default: ""
 
@@ -116,7 +114,6 @@ runs:
         use_bedrock: ${{ inputs.use_bedrock }}
         use_vertex: ${{ inputs.use_vertex }}
         anthropic_api_key: ${{ inputs.anthropic_api_key }}
-        claude_env: ${{ inputs.claude_env }}
       env:
         # Model configuration
         ANTHROPIC_MODEL: ${{ inputs.model || inputs.anthropic_model }}