feat: add review_plan prompt builder

TASKS.md

@@ -193,7 +193,7 @@ Requirements:
 
 Status: ✅ Complete
 
-### Task 3.4 - review_plan prompt builder (NEXT)
+### Task 3.4 - review_plan prompt builder (completed)
 
 Create `src/prompts/review-plan.js`.
 
@@ -209,6 +209,25 @@ Create `test/prompts/review-plan.test.js`.
 Requirements:
 - Mirror structure of ask-chatgpt tests: base composition, review_plan-specific instructions, optional fields, expectedOutput, input validation, tool guard, full integration.
 
+Status: ✅ Complete
+
+### Task 3.5 - review_code prompt builder (NEXT)
+
+Create `src/prompts/review-code.js`.
+
+Requirements:
+- Export a `buildReviewCodePrompt(input)` function that returns a tool-specific prompt for the review_code MCP tool.
+- Compose with `buildBasePrompt()` — call it internally and append the result with `---` separator.
+- Instruct ChatGPT to review focused code snippets, patches, or diffs.
+- Look for: correctness issues, bugs, maintainability concerns, security issues, test gaps, simpler approaches.
+- Request response in structured format: Issues by Severity, Suggested Fixes, Test Suggestions.
+- No other tool prompts yet (debug_issue, architecture_review, etc.).
+
+Create `test/prompts/review-code.test.js`.
+
+Requirements:
+- Mirror structure of ask-chatgpt and review-plan tests: base composition, review_code-specific instructions, optional fields, expectedOutput, input validation, tool guard, full integration.
+
 Status: ⬜ Pending
 
 ---