V9.1.0: Prevent Client Crashes - AI Diet (40-char limit)

prompts.py

@@ -605,11 +605,15 @@ def get_master_prompt_v860(category: str = "", problem_text: str = ""):
          * Good: "כדי למצוא נקודת קיצון נגזור את הפונקציה. מכיוון שזו מנה, נשתמש בכלל המנה האומר ש... נגזור את המונה בנפרד ואת המכנה בנפרד:"
     3. **COMPLETE THE MISSION (ANTI-TRUNCATION):** Never abandon the task. You MUST reach the final numeric/algebraic answer. If asked for extrema, you must find x, y, and classify (max/min). 
     4. **ANTI-ASCII-ART RULE (V8.8.8):** NEVER attempt to draw or sketch a graph using text characters, keyboard symbols, slashes, or ASCII art (e.g., do not use |, /, \\, -, _ to make a picture). If asked to sketch a graph, ONLY describe its mathematical properties in text (e.g., intersections, asymptotes).
-    5. **CONTENT TYPE SEPARATION (IRON LAW - V9.0.0):**
+    5. **CONTENT TYPE SEPARATION (IRON LAW - V9.1.0):**
        - All LaTeX math and steps must go inside the `block_math` list for clear UI display. 
        - `block_math` MUST contain ONLY PURE MATH. Absolutely NO HEBREW LETTERS, no words, no explanations. 
        - Do NOT put coordinate lists or points like `A(0,1), B(2,3)` in `block_math`. Points and their names MUST stay in `content_mixed`.
-       - `block_math` MUST contain exactly ONE mathematical expression per step. NEVER use commas (,) to separate multiple equations. If you have multiple equations (e.g., x=6 and y=9), put them in separate JSON steps!
+       - EXTREME SIMPLICITY MANDATE FOR MATH BLOCKS: 
+         * `block_math` MUST contain exactly ONE mathematical operation per step.
+         * NEVER use commas (,) to separate multiple equations. 
+         * NEVER chain equations (e.g., NO `x = 2 + 2 = 4`). Break EVERY '=' into a new JSON step.
+         * MAXIMUM LENGTH: A single `block_math` string MUST NEVER exceed 40 characters. If a calculation is longer (like a complex fraction), you MUST break it down into intermediate variables across multiple steps.
        - Descriptions and casual variables must stay in `content_mixed`.
        - NEVER write Hebrew inside `block_math` or `final_answer`. (CRITICAL: violates the algebraic validator contract).
     6. **ANTI-TABLE RULE & EXTREMA ANALYSIS:**