fix: guard remaining unguarded prompts with skipPrompts for non-interactive mode

Add skipPrompts guards to 4 remaining unguarded interactive prompts in
installer.js that caused hangs in non-interactive mode (--yes flag):
- Module removal confirmation: preserves modules by default
- Update action selection: defaults to 'update'
- Custom module missing sources: keeps all modules
- Custom module delete confirmation: unreachable via early return

Additional robustness fixes:
- Defensive type-check before .trim() on prompt result (symbol guard)
- Console.log suppression scoped per-IDE instead of global try/finally
- process.exit flush via setImmediate for legacy v4 exit path
- JSDoc updated for new skipPrompts parameter

Follows established pattern from commit f967fdde (IDE skipPrompts guards).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/cli/installers/lib/core/installer.js

@@ -415,6 +415,9 @@ class Installer {
         let action = null;
         if (config.actionType === 'update') {
           action = 'update';
+        } else if (config.skipPrompts) {
+          // Non-interactive mode: default to update
+          action = 'update';
         } else {
           // Fallback: Ask the user (backwards compatibility for other code paths)
           await prompts.log.warn('Existing BMAD installation detected');
@@ -440,6 +443,14 @@ class Installer {
 
           // If there are modules to remove, ask for confirmation
           if (modulesToRemove.length > 0) {
+            if (config.skipPrompts) {
+              // Non-interactive mode: preserve modules (matches prompt default: false)
+              for (const moduleId of modulesToRemove) {
+                if (!config.modules) config.modules = [];
+                config.modules.push(moduleId);
+              }
+              spinner.start('Preparing update...');
+            } else {
               const prompts = require('../../../lib/prompts');
               if (spinner.isSpinning) {
                 spinner.stop('Reviewing module changes');
@@ -483,6 +494,7 @@ class Installer {
 
               spinner.start('Preparing update...');
             }
+          }
 
           // Detect custom and modified files BEFORE updating (compare current files vs files-manifest.csv)
           const existingFilesManifest = await this.readFilesManifest(bmadDir);
@@ -1085,13 +1097,6 @@ class Installer {
           // Check if any IDE might need prompting (no pre-collected config)
           const needsPrompting = validIdes.some((ide) => !ideConfigurations[ide]);
 
-          // Temporarily suppress console output if not verbose
-          const originalLog = console.log;
-          if (!config.verbose) {
-            console.log = () => {};
-          }
-
-          try {
           for (const ide of validIdes) {
             if (!needsPrompting || ideConfigurations[ide]) {
               // All IDEs pre-configured, or this specific IDE has config: keep spinner running
@@ -1105,6 +1110,13 @@ class Installer {
 
             // Silent when this IDE has pre-collected config (no prompts for THIS IDE)
             const ideHasConfig = Boolean(ideConfigurations[ide]);
+
+            // Suppress stray console output for pre-configured IDEs (no user interaction)
+            const originalLog = console.log;
+            if (!config.verbose && ideHasConfig) {
+              console.log = () => {};
+            }
+            try {
               const setupResult = await this.ideManager.setup(ide, projectDir, bmadDir, {
                 selectedModules: allModules || [],
                 preCollectedConfig: ideConfigurations[ide] || null,
@@ -1123,15 +1135,15 @@ class Installer {
               } else {
                 addResult(ide, 'error', setupResult.error || 'failed');
               }
+            } finally {
+              console.log = originalLog;
+            }
 
             // Restart spinner if we stopped it for prompting
             if (needsPrompting && !spinner.isSpinning) {
               spinner.start('Configuring IDEs...');
             }
           }
-          } finally {
-            console.log = originalLog;
-          }
         }
       }
 
@@ -1396,6 +1408,7 @@ class Installer {
           projectRoot,
           'update',
           existingInstall.modules.map((m) => m.id),
+          config.skipPrompts || false,
         );
 
         spinner.start('Preparing update...');
@@ -2259,6 +2272,7 @@ class Installer {
         projectRoot,
         'update',
         installedModules,
+        config.skipPrompts || false,
       );
 
       const { validCustomModules, keptModulesWithoutSources } = customModuleResult;
@@ -2516,7 +2530,9 @@ class Installer {
 
     if (proceed === 'exit') {
       await prompts.log.info('Please remove the .bmad-method folder and any v4 rules/commands, then run the installer again.');
-      process.exit(0);
+      // Allow event loop to flush pending I/O before exit
+      setImmediate(() => process.exit(0));
+      return;
     }
 
     await prompts.log.warn('Proceeding with installation despite legacy v4 folder');
@@ -2700,9 +2716,10 @@ class Installer {
    * @param {string} projectRoot - Project root directory
    * @param {string} operation - Current operation ('update', 'compile', etc.)
    * @param {Array} installedModules - Array of installed module IDs (will be modified)
+   * @param {boolean} [skipPrompts=false] - Skip interactive prompts and keep all modules with missing sources
    * @returns {Object} Object with validCustomModules array and keptModulesWithoutSources array
    */
-  async handleMissingCustomSources(customModuleSources, bmadDir, projectRoot, operation, installedModules) {
+  async handleMissingCustomSources(customModuleSources, bmadDir, projectRoot, operation, installedModules, skipPrompts = false) {
     const validCustomModules = [];
     const keptModulesWithoutSources = []; // Track modules kept without sources
     const customModulesWithMissingSources = [];
@@ -2745,6 +2762,14 @@ class Installer {
       };
     }
 
+    // Non-interactive mode: keep all modules with missing sources
+    if (skipPrompts) {
+      for (const missing of customModulesWithMissingSources) {
+        keptModulesWithoutSources.push(missing.id);
+      }
+      return { validCustomModules, keptModulesWithoutSources };
+    }
+
     await prompts.log.warn(`Found ${customModulesWithMissingSources.length} custom module(s) with missing sources:`);
 
     let keptCount = 0;
@@ -2809,6 +2834,13 @@ class Installer {
             },
           });
 
+          // Defensive: handleCancel should have exited, but guard against symbol propagation
+          if (typeof newSourcePath !== 'string') {
+            keptCount++;
+            keptModulesWithoutSources.push(missing.id);
+            continue;
+          }
+
           // Update the source in manifest
           const resolvedPath = path.resolve(newSourcePath.trim());
           missing.info.sourcePath = resolvedPath;