Update agent to automatically use cross-platform commit helper

- Modified system prompts to instruct agent to use commit-helper.js
- Updated git utilities to call commit helper as primary method
- Resolves automatic heredoc issue handling for agent commits

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: PierrunoYT

backend/src/system-prompt/prompts.ts

@@ -268,38 +268,31 @@ When the user requests a new git commit, please follow these steps closely:
    - Refrain from using tools to inspect code beyond what is presented in the git context.
    - Evaluate the overall impact on the project.
    - Check for sensitive details that should not be committed.
-   - Draft a concise, one- to two-sentence commit message focusing on the “why” rather than the “what.”
+   - Draft a concise, one- to two-sentence commit message focusing on the "why" rather than the "what."
    - Use precise, straightforward language that accurately represents the changes.
-   - Ensure the message provides clarity—avoid generic or vague terms like “Update” or “Fix” without context.
+   - Ensure the message provides clarity—avoid generic or vague terms like "Update" or "Fix" without context.
    - Revisit your draft to confirm it truly reflects the changes and their intention.
 
-4. **Create the commit, ending with this specific footer:**
-   \`\`\`
-   Generated with Codebuff 🤖
-   Co-Authored-By: Codebuff <noreply@codebuff.com>
-   \`\`\`
-   To maintain proper formatting, use cross-platform compatible commit messages:
+4. **Create the commit using the cross-platform commit helper:**
+
+   **Always use the cross-platform commit helper** to ensure compatibility across all platforms:
    
-   **For Unix/bash shells:**
    \`\`\`
-   git commit -m "$(cat <<'EOF'
-   Your commit message here.
-
-   🤖 Generated with Codebuff
-   Co-Authored-By: Codebuff <noreply@codebuff.com>
-   EOF
-   )"
+   node scripts/commit-helper.js "Your commit message here" "🤖 Generated with Codebuff" "Co-Authored-By: Codebuff <noreply@codebuff.com>"
    \`\`\`
    
-   **For Windows Command Prompt:**
+   The commit helper automatically:
+   - Handles cross-platform compatibility (Windows, macOS, Linux)
+   - Formats multiline commit messages properly
+   - Adds factory-droid co-author attribution  
+   - Uses temporary files to avoid shell escaping issues
+   
+   For simple commits with just Codebuff attribution:
    \`\`\`
-   git commit -m "Your commit message here.
-
-   🤖 Generated with Codebuff
-   Co-Authored-By: Codebuff <noreply@codebuff.com>"
+   node scripts/commit-helper.js "Your commit message here 🤖 Generated with Codebuff"
    \`\`\`
    
-   Always detect the platform and use the appropriate syntax. HEREDOC syntax (\`<<'EOF'\`) only works in bash/Unix shells and will fail on Windows Command Prompt.
+   **NEVER use heredoc syntax** (\`<<'EOF'\`) or direct \`git commit -m\` with complex messages as they fail on Windows Command Prompt.
 
 **Important details**
 

common/src/util/git.ts

@@ -25,8 +25,14 @@ export function getStagedChanges(): string {
 
 export function commitChanges(commitMessage: string) {
   try {
-    execSync(`git commit -m "${commitMessage}"`, { stdio: 'ignore', maxBuffer })
-  } catch (error) {}
+    // Use cross-platform commit helper to avoid heredoc issues on Windows
+    execSync(`node scripts/commit-helper.js "${commitMessage}"`, { stdio: 'inherit', maxBuffer })
+  } catch (error) {
+    // Fallback to direct git commit if helper is not available
+    try {
+      execSync(`git commit -m "${commitMessage}"`, { stdio: 'ignore', maxBuffer })
+    } catch (fallbackError) {}
+  }
 }
 
 export function stageAllChanges(): boolean {