fix: address PR review issues for auto-mode refactor

- agent-executor: move executeQuery into try block for proper heartbeat cleanup,
  re-parse tasks when edited plan is approved
- auto-loop-coordinator: handle feature execution failures with proper logging
  and failure tracking, support backward-compatible method signatures
- facade: delegate getActiveAutoLoopProjects/Worktrees to coordinator,
  always create own AutoLoopCoordinator (not shared), pass projectPath
  to approval methods and branchName to failure tracking
- global-service: document shared autoLoopCoordinator is for monitoring only
- execution-types: fix ExecuteFeatureFn type to match implementation
- feature-state-manager: use readJsonWithRecovery for loadFeature
- pipeline-orchestrator: add defensive null check and try/catch for
  merge response parsing
- plan-approval-service: use project-scoped keys to prevent cross-project
  collisions, maintain backward compatibility for featureId-only lookups

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/src/services/pipeline-orchestrator.ts

@@ -495,11 +495,23 @@ export class PipelineOrchestrator {
         }),
       });
 
-      const data = (await response.json()) as {
-        success: boolean;
-        hasConflicts?: boolean;
-        error?: string;
-      };
+      if (!response) {
+        return { success: false, error: 'No response from merge endpoint' };
+      }
+
+      // Defensively parse JSON response
+      let data: { success: boolean; hasConflicts?: boolean; error?: string };
+      try {
+        data = (await response.json()) as {
+          success: boolean;
+          hasConflicts?: boolean;
+          error?: string;
+        };
+      } catch (parseError) {
+        logger.error(`Failed to parse merge response:`, parseError);
+        return { success: false, error: 'Invalid response from merge endpoint' };
+      }
+
       if (!response.ok) {
         if (data.hasConflicts) {
           await this.updateFeatureStatusFn(projectPath, featureId, 'merge_conflict');