Fix servlet EC lifecycle, remove EntityFind diagnostic, remove renderedContent truncation

- EnhancedMcpServlet: Reuse existing ExecutionContext from MoquiAuthFilter instead of creating duplicate
- EnhancedMcpServlet: Removed manual EC destruction - auth filter handles cleanup
- McpServices: Skip EntityFind objects in serialization (they're query definitions, not data)
- McpServices: Make patchScreenRenderForNullFieldNode static for call from static context
- McpServices: Remove renderedContent for renderMode 'mcp' to avoid JSON duplication/truncation
- AGENTS.md: Document rebuild.sh script usage
- mcp.sh: Use hidden session file (.mcp_session_USER)
- rebuild.sh: Fix shell syntax error and add startup wait logic

@@ -17,8 +17,26 @@
 
 <#macro "fail-widgets"><#recurse></#macro>
 
-<#-- ================ Subscreens ================ -->
-<#macro "subscreens-menu"></#macro>
+ <#-- ================ Subscreens ================ -->
+<#macro "subscreens-menu">
+    <#if mcpSemanticData??>
+        <#list sri.getActiveScreenDef().getMenuSubscreensItems() as subscreen>
+            <#if subscreen.name?has_content>
+                <#assign urlInstance = sri.buildUrl(subscreen.name)>
+                <#if urlInstance.isPermitted()>
+                    <#assign fullPath = urlInstance.sui.fullPathNameList![]>
+                    <#assign slashPath = "">
+                    <#list fullPath as pathPart><#assign slashPath = slashPath + (slashPath?has_content)?then("/", "") + pathPart></#list>
+
+                    <#assign linkText = subscreen.menuTitle?has_content?then(subscreen.menuTitle, subscreen.name)>
+
+                    <#assign linkType = "navigation">
+                    <#assign dummy = ec.resource.expression("mcpSemanticData.links.add([text: '" + (linkText!"")?js_string + "', path: '" + (slashPath!"")?js_string + "', type: '" + linkType + "'])", "")!>
+                </#if>
+            </#if>
+        </#list>
+    </#if>
+</#macro>
 <#macro "subscreens-active">${sri.renderSubscreen()}</#macro>
 <#macro "subscreens-panel">${sri.renderSubscreen()}</#macro>
 

@@ -722,6 +722,10 @@ serializeMoquiObject = { obj, depth = 0, isTerse = false ->
     if (obj.getClass().getName().startsWith("org.moqui.impl.screen.ScreenDefinition")) {
         return [location: obj.location]
     }
+    // Skip EntityFind objects entirely - they're query definitions, not actual data
+    if (obj instanceof org.moqui.entity.EntityFind) {
+        return null
+    }
     // Fallback for unknown types - truncate if too long
     def str = obj.toString()
     if (str.length() > 200) {
@@ -1695,11 +1699,6 @@ def wikiInstructions = getWikiInstructions(inputScreenPath)
                                 } catch (Exception e) {
                                     ec.logger.warn("BrowseScreens: Failed to generate UI narrative: ${e.message}")
                                 }
-
-                                // Only truncate if terse=true
-                                if (renderedContent && context.terse == true && renderedContent.length() > 500) {
-                                    renderedContent = renderedContent.take(500) + "... (truncated, see uiNarrative for actions)"
-                                }
                             }
                         }
 
@@ -1713,19 +1712,16 @@ def wikiInstructions = getWikiInstructions(inputScreenPath)
                 if (actionResult) {
                     resultMap.actionResult = actionResult
                 }
+
+                // Don't include renderedContent for renderMode "mcp" - semanticState provides structured data
+                // Including both duplicates data and truncation breaks JSON structure
+                if (renderedContent && actualRenderMode != "mcp") {
+                    resultMap.renderedContent = renderedContent
+                }
                 
                 if (actionError) {
                     resultMap.actionError = actionError
                 }
-                
-                if (renderedContent) {
-                    resultMap.renderedContent = renderedContent
-                }
-
-                // Handle empty content case
-                if (!renderedContent && !renderError) {
-                    resultMap.renderedContent = "SCREEN_RENDERED_EMPTY: No output generated (screen may be waiting for parameters or has no content)"
-                }
 
                 if (wikiInstructions) {
                     resultMap.wikiInstructions = wikiInstructions

@@ -32,7 +32,6 @@ import org.slf4j.LoggerFactory
  * This provides a proper web context for screen rendering in MCP environment
  * using the MCP component's WebFacadeStub instead of the framework's buggy one
  */
-@CompileStatic
 class CustomScreenTestImpl implements McpScreenTest {
     
     protected final static Logger logger = LoggerFactory.getLogger(CustomScreenTestImpl.class)
@@ -84,6 +83,46 @@ class CustomScreenTestImpl implements McpScreenTest {
         return new org.moqui.mcp.WebFacadeStub(ecfi, parameters, sessionAttributes, requestMethod, screenPath)
     }
 
+    /**
+     * Patch ScreenRender instance to handle null fieldNode in getFieldValueString.
+     * This is a workaround for upstream Moqui bug where widget-template-include
+     * creates widget nodes with incomplete parent chain.
+     */
+    protected static void patchScreenRenderForNullFieldNode(ScreenRender screenRender) {
+        try {
+            def sriImpl = screenRender
+            def originalGetFieldValueString = sriImpl.&getFieldValueString
+
+            sriImpl.metaClass.getFieldValueString = { MNode widgetNode ->
+                if (widgetNode != null && widgetNode.parent != null && widgetNode.parent.parent != null) {
+                    return originalGetFieldValueString(widgetNode)
+                } else {
+                    String defaultValue = widgetNode?.attribute("default-value") ?: ""
+                    return delegate.ec.resourceFacade.expandNoL10n(defaultValue, null)
+                }
+            }
+
+            def originalGetFieldValueClass = sriImpl.&getFieldValueClass
+            sriImpl.metaClass.getFieldValueClass = { MNode fieldNodeWrapper ->
+                if (fieldNodeWrapper == null) return "String"
+                return originalGetFieldValueClass(fieldNodeWrapper)
+            }
+
+            def originalGetFieldEntityValue = sriImpl.&getFieldEntityValue
+            sriImpl.metaClass.getFieldEntityValue = { MNode widgetNode ->
+                if (widgetNode != null && widgetNode.parent != null && widgetNode.parent.parent != null) {
+                    return originalGetFieldEntityValue(widgetNode)
+                } else {
+                    return delegate.getDefaultText(widgetNode)
+                }
+            }
+
+            logger.debug("Patched ScreenRender with null fieldNode protection")
+        } catch (Throwable t) {
+            logger.warn("Failed to patch ScreenRender: ${t.getMessage()}", t)
+        }
+    }
+
     @Override
     McpScreenTest rootScreen(String screenLocation) {
         rootScreenLocation = screenLocation
@@ -205,7 +244,6 @@ class CustomScreenTestImpl implements McpScreenTest {
     /**
      * Custom ScreenTestRenderImpl that uses our WebFacadeStub
      */
-    @CompileStatic
     static class CustomScreenTestRenderImpl implements McpScreenTestRender {
         protected final CustomScreenTestImpl sti
         String screenPath = (String) null
@@ -334,8 +372,10 @@ class CustomScreenTestImpl implements McpScreenTest {
             // Put web facade objects in context for screen access
             cs.put("html_scripts", wfs.getHtmlScripts())
             cs.put("html_stylesheets", wfs.getHtmlStyleSheets())
-            // make the ScreenRender
+            // make ScreenRender
             ScreenRender screenRender = csti.sfi.makeRender()
+            // Patch ScreenRender to handle null fieldNode in getFieldValueString
+            patchScreenRenderForNullFieldNode(screenRender)
             stri.screenRender = screenRender
             // pass through various settings
             if (csti.rootScreenLocation != null && csti.rootScreenLocation.length() > 0) screenRender.rootScreen(csti.rootScreenLocation)

@@ -127,19 +127,17 @@ class EnhancedMcpServlet extends HttpServlet {
         if (handleCors(request, response, webappName, ecfi)) return
         
         long startTime = System.currentTimeMillis()
-        
+
         if (logger.traceEnabled) {
             logger.trace("Start Enhanced MCP request to [${request.getPathInfo()}] at time [${startTime}] in session [${request.session.id}] thread [${Thread.currentThread().id}:${Thread.currentThread().name}]")
         }
-        
-        ExecutionContextImpl activeEc = ecfi.activeContext.get()
-        if (activeEc != null) {
-            logger.warn("In EnhancedMcpServlet.service there is already an ExecutionContext for user ${activeEc.user.username}")
-            activeEc.destroy()
+
+        ExecutionContextImpl ec = ecfi.activeContext.get()
+        if (ec == null) {
+            logger.warn("No ExecutionContext found from MoquiAuthFilter, creating new one")
+            ec = ecfi.getEci()
         }
         
-        ExecutionContextImpl ec = ecfi.getEci()
-        
         try {
             // Read request body VERY early before any other processing can consume it
             String requestBody = null
@@ -235,8 +233,6 @@ class EnhancedMcpServlet extends HttpServlet {
             // Use simple JSON string to avoid Groovy JSON library issues
             def errorMsg = t.message?.toString() ?: "Unknown error"
             response.writer.write("{\"jsonrpc\":\"2.0\",\"error\":{\"code\":-32603,\"message\":\"Internal error: ${errorMsg.replace("\"", "\\\"")}\"},\"id\":null}")
-        } finally {
-            ec.destroy()
         }
     }