feat: Add automatic solution monitor disabling for multi-solution workflows

Problem:
When running optimization studies with multiple solutions (e.g., static + modal),
NX opens solution monitor windows for each trial. These windows superpose and cause
usability issues during long optimization runs.

Solution:
- Automatically disable solution monitor when solving all solutions (solution_name=None)
- Loop through all solutions and set "solution monitor" property to False
- Implemented in solve_simulation.py before solve execution (lines 271-295)
- Includes error handling with graceful fallback

Benefits:
- No monitor window pile-up during optimization studies
- Better performance (no GUI overhead)
- No user configuration required - works automatically
- Based on user-recorded journal (journal_monitor_window_off.py)

Documentation:
- Updated docs/NX_MULTI_SOLUTION_PROTOCOL.md with solution monitor control section
- Added implementation details and when the feature activates
- Cross-referenced user's recorded journal

Implementation: optimization_engine/solve_simulation.py
Documentation: docs/NX_MULTI_SOLUTION_PROTOCOL.md
Reference: nx_journals/user_generated_journals/journal_monitor_window_off.py

docs/NX_MULTI_SOLUTION_PROTOCOL.md

@@ -142,11 +142,65 @@ After implementing the fix, verify:
 
 ---
 
+## Solution Monitor Window Control (November 24, 2025)
+
+### Problem: Monitor Window Pile-Up
+
+When running optimization studies with multiple trials, NX opens solution monitor windows for each trial. These windows:
+- Superpose on top of each other
+- Cannot be easily closed programmatically
+- Cause usability issues during long optimization runs
+- Slow down the optimization process
+
+### Solution: Automatic Monitor Disabling
+
+The solution monitor is now automatically disabled when solving multiple solutions (when `solution_name=None`).
+
+**Implementation**: `optimization_engine/solve_simulation.py` lines 271-295
+
+```python
+# CRITICAL: Disable solution monitor when solving multiple solutions
+# This prevents NX from opening multiple monitor windows which superpose and cause usability issues
+if not solution_name:
+    print("[JOURNAL] Disabling solution monitor for all solutions to prevent window pile-up...")
+    try:
+        # Get all solutions in the simulation
+        solutions_disabled = 0
+        solution_num = 1
+        while True:
+            try:
+                solution_obj_name = f"Solution[Solution {solution_num}]"
+                simSolution = simSimulation1.FindObject(solution_obj_name)
+                if simSolution:
+                    propertyTable = simSolution.SolverOptionsPropertyTable
+                    propertyTable.SetBooleanPropertyValue("solution monitor", False)
+                    solutions_disabled += 1
+                    solution_num += 1
+                else:
+                    break
+            except:
+                break  # No more solutions
+        print(f"[JOURNAL]   Solution monitor disabled for {solutions_disabled} solution(s)")
+    except Exception as e:
+        print(f"[JOURNAL]   WARNING: Could not disable solution monitor: {e}")
+        print(f"[JOURNAL]   Continuing with solve anyway...")
+```
+
+**When this activates**:
+- Automatically when `solution_name=None` (solve all solutions mode)
+- For any study with multiple trials (typical optimization scenario)
+- No user configuration required
+
+**User-recorded journal**: `nx_journals/user_generated_journals/journal_monitor_window_off.py`
+
+---
+
 ## Related Issues Fixed
 
 1. **All trials showing identical frequency**: Fixed by ensuring modal solution runs
 2. **Only one data point in dashboard**: Fixed by all trials succeeding
 3. **Parallel coordinates with NaN**: Fixed by having complete data from all solutions
+4. **Solution monitor windows piling up**: Fixed by automatically disabling monitor for multi-solution runs
 
 ---