Execute the research according to the plan (or additional research instructions).

**What to do:**
1. Execute planned research items in order
2. Actually investigate each item (web search, codebase search, etc.)
3. Report items that could not be researched as "Unable to research"
4. Organize results and create a report

**Report structure:**
- Results and details per research item
- Summary of key findings
- Caveats and risks
- Items unable to research and reasons
- Recommendations/conclusions
