fix(conductor): Enforce strict statelessness and robust JSON parsing for subagents

scripts/run_subagent.ps1

@@ -8,5 +8,29 @@ param(
 # Ensure the session has the API key loaded
 . C:\projects\misc\setup_gemini.ps1
 
-# Piping an empty string ensures stdin is closed, forcing the Gemini CLI to terminate naturally after answering.
-echo "" | gemini $Prompt --model $Model
+# Prepend a strict system instruction to the prompt to prevent the model from entering a tool-usage loop
+$SafePrompt = "STRICT SYSTEM DIRECTIVE: You are a stateless utility function. DO NOT USE ANY TOOLS (no write_file, no run_shell_command, etc.). ONLY output the exact requested text, code, or JSON.`n`nUSER PROMPT:`n$Prompt"
+
+# Execute headless Gemini using -p, suppressing stderr noise
+$jsonOutput = gemini -p $SafePrompt --model $Model --output-format json 2>$null
+
+try {
+    # Extract only the JSON part
+    $fullString = $jsonOutput -join "`n"
+    $jsonStartIndex = $fullString.IndexOf("{")
+    
+    if ($jsonStartIndex -ge 0) {
+        $cleanJsonString = $fullString.Substring($jsonStartIndex)
+        $parsed = $cleanJsonString | ConvertFrom-Json
+        
+        # Output only the clean response text
+        Write-Output $parsed.response
+    } else {
+        Write-Warning "No JSON object found in output."
+        Write-Output $fullString
+    }
+} catch {
+    # Fallback if parsing fails
+    Write-Warning "Failed to parse JSON from sub-agent. Raw output:"
+    Write-Output $jsonOutput
+}