feat(mma): Implement Tier 4 QA interceptor in shell_runner.py

shell_runner.py

@@ -1,14 +1,16 @@
 # shell_runner.py
 import subprocess, shutil
 from pathlib import Path
+from typing import Callable, Optional
 
 TIMEOUT_SECONDS = 60
 
-def run_powershell(script: str, base_dir: str) -> str:
+def run_powershell(script: str, base_dir: str, qa_callback: Optional[Callable[[str], str]] = None) -> str:
     """
     Run a PowerShell script with working directory set to base_dir.
     Returns a string combining stdout, stderr, and exit code.
-    Raises nothing - all errors are captured into the return string.
+    If qa_callback is provided and the command fails or has stderr, 
+    the callback is called with the stderr content and its result is appended.
     """
     safe_dir = str(base_dir).replace("'", "''")
     full_script = f"Set-Location -LiteralPath '{safe_dir}'\n{script}"
@@ -25,6 +27,13 @@ def run_powershell(script: str, base_dir: str) -> str:
         if r.stdout.strip(): parts.append(f"STDOUT:\n{r.stdout.strip()}")
         if r.stderr.strip(): parts.append(f"STDERR:\n{r.stderr.strip()}")
         parts.append(f"EXIT CODE: {r.returncode}")
+        
+        # QA Interceptor logic
+        if (r.returncode != 0 or r.stderr.strip()) and qa_callback:
+            qa_analysis = qa_callback(r.stderr.strip())
+            if qa_analysis:
+                parts.append(f"\nQA ANALYSIS:\n{qa_analysis}")
+                
         return "\n".join(parts)
     except subprocess.TimeoutExpired: return f"ERROR: timed out after {TIMEOUT_SECONDS}s"
     except Exception as e: return f"ERROR: {e}"