Add basic research workflow with Tavily integration

[Copilot]

Overview

This PR adds an ultra basic agentic workflow that enables users to perform quick research and summarization on any topic using Tavily's web search capabilities.

What's New

A new workflow file .github/workflows/research.md that provides:

• Manual trigger: Workflow can be triggered via workflow_dispatch with a required topic input
• Tavily integration: Uses the Tavily MCP server for web search and information gathering
• Automated discussion creation: Research findings are automatically posted as a GitHub discussion in the "research" category with:
  • Summary of key findings and relevant sources
• Minimal permissions: Main job runs with read-only permissions (contents: read, actions: read)
• Cost control: 10-minute timeout prevents runaway execution

How to Use

1. Navigate to the Actions tab in the repository
2. Select "Basic Research Agent" workflow
3. Click "Run workflow"
4. Enter a research topic (e.g., "latest developments in AI code generation")
5. The agent will search for information and create a discussion with findings

Example Output

When triggered with a topic like "GitHub Actions best practices", the workflow will:

1. Use Tavily to search for current information on the topic
2. Analyze search results to identify key information
3. Create a GitHub discussion containing:
   • Brief overview of the topic
   • Key findings from research
   • Relevant sources and links

Technical Details

The workflow follows the agentic workflow pattern established in the repository:

• Uses GitHub Copilot CLI as the AI engine
• Imports the shared Tavily MCP server configuration
• Implements safe-outputs pattern for secure discussion creation
• Includes strict mode for enhanced validation

Testing

• ✅ Workflow compiles successfully with no errors or warnings
• ✅ Build, formatting, and linting pass
• ✅ Tavily MCP server correctly configured in compiled YAML
• ✅ Safe-outputs create-discussion job properly generated
• ✅ All manual verification checks pass

Note: Two pre-existing test failures in pkg/workflow (TestAIReactionWithCommentEditFunctionality and TestCommandReactionWithCommentEdit) are unrelated to this change and were present before this PR.

Original prompt

Add a ultra basic agentic workflow that takes a workflow dispatch + topic input and does a simple research/summary of the topic using Tavily

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[pelikhan]

@copilot use create-discussion

[Copilot]

Changed to use create-discussion with category "research" in commit efb4a9a+.