feat(snippets): add dynamic language detection for code blocks

✅ Tasks #1 & #2 Complete: Code Snippets + Fix Suggestions

Changes:
- Added getLanguageFromFile() helper method (lines 1641-1665)
  - Supports 20+ file extensions (Java, Python, JS/TS, Go, Rust, etc.)
  - Returns appropriate language for syntax highlighting

- Updated code snippet display (line 1415)
  - Changed from hardcoded 'java' to dynamic language detection
  - Proper syntax highlighting for all supported languages

- Updated fix suggestion display (line 1451)
  - Changed from hardcoded 'java' to dynamic language detection
  - Corrected code shows in proper language syntax

Existing Features (Already Implemented):
- ✅ Code snippets with file location (lines 1402-1419)
- ✅ Fix suggestions with diff format (lines 1421-1463)
- ✅ Before/After comparison with +/- diff syntax
- ✅ Best practices recommendations
- ✅ Clean-up of internal bug tracker references

Language Support:
- Java, Scala, Kotlin, Gradle
- Python
- JavaScript, JSX, TypeScript, TSX
- Go, Rust, Ruby, PHP
- C, C++, C#, Swift
- YAML, JSON, XML, SQL, Bash

Files Modified:
- v9-grouped-report-formatter.ts:
  - Lines 1415, 1451: Dynamic language detection
  - Lines 1638-1665: getLanguageFromFile() method

Time: ~15 minutes (code was already there, just needed helper method)
Next: Copy remaining report sections (Business Impact, Education, PR Comment, Metadata)

Author: alpsla

packages/agents/src/two-branch/analyzers/v9-grouped-report-formatter.ts

@@ -1412,7 +1412,8 @@ ${qualityResult.categoryScores ? `
 
       if (representative.snippet && representative.snippet !== 'N/A' && representative.snippet.trim().length > 0) {
         section += `**Code**:\n\n`;
-        section += '```java\n';
+        const language = this.getLanguageFromFile(representative.file);
+        section += `\`\`\`${language}\n`;
         section += representative.snippet;
         section += '\n```\n\n';
       }
@@ -1447,7 +1448,8 @@ ${qualityResult.categoryScores ? `
           section += '\n```\n\n';
         } else {
           section += `**Recommended Code**:\n\n`;
-          section += '```java\n';
+          const language = this.getLanguageFromFile(representative.file);
+          section += `\`\`\`${language}\n`;
           section += representative.fixSuggestion.correctedCode;
           section += '\n```\n\n';
         }
@@ -1633,6 +1635,35 @@ ${qualityResult.categoryScores ? `
     return 'low';
   }
 
+  /**
+   * Get programming language from file extension for syntax highlighting
+   */
+  private getLanguageFromFile(file: string): string {
+    if (file.endsWith('.java')) return 'java';
+    if (file.endsWith('.scala')) return 'scala';
+    if (file.endsWith('.gradle')) return 'gradle';
+    if (file.endsWith('.kt') || file.endsWith('.kts')) return 'kotlin';
+    if (file.endsWith('.py')) return 'python';
+    if (file.endsWith('.js')) return 'javascript';
+    if (file.endsWith('.jsx')) return 'jsx';
+    if (file.endsWith('.ts')) return 'typescript';
+    if (file.endsWith('.tsx')) return 'tsx';
+    if (file.endsWith('.go')) return 'go';
+    if (file.endsWith('.rs')) return 'rust';
+    if (file.endsWith('.rb')) return 'ruby';
+    if (file.endsWith('.php')) return 'php';
+    if (file.endsWith('.c')) return 'c';
+    if (file.endsWith('.cpp') || file.endsWith('.cc') || file.endsWith('.cxx')) return 'cpp';
+    if (file.endsWith('.cs')) return 'csharp';
+    if (file.endsWith('.swift')) return 'swift';
+    if (file.endsWith('.sh')) return 'bash';
+    if (file.endsWith('.yml') || file.endsWith('.yaml')) return 'yaml';
+    if (file.endsWith('.json')) return 'json';
+    if (file.endsWith('.xml')) return 'xml';
+    if (file.endsWith('.sql')) return 'sql';
+    return 'text';
+  }
+  
   /**
    * Determine if safe to auto-apply without review
    */