feat: implement Geometric Sanity Engine (V1.0) and fix project ID in functions

Fix: Quota logic for admins and updated firestore rules

V9.0.5: Prevent SSE Disconnects - Non-Blocking SymPy Validator & Timeout Optimization

V9.0.2: CRITICAL Fix - Data Anchor Failure via Robust OCR Payload Flattener

V9.0.1: SymPy Pipeline Hardening (Aggressive Sanitizer, Hebrew & Arrow Stripping)

V9.0.0: Final Stabilization (Fixed NameError, Prompt Hardening, OCR Flattening)

Emergency Fix: Resolve NameError in Anchor Validation and Sync pedagogical prompts (V5.13.16)

Fix NameError in build_ast_metadata and improve logging

DEV: SymPy Stabilization, OCR Hotfix, and UI Prep (V5.13.16)

fix: SymPy squashed equations and enforce RULE 4 in orchestrator

V5.13.14: OCR Reliability Layer (Upscaling/Binarization) and temperature=0.0 enforcement

Token Burner Prevention: fallback to raw OCR and slicing failsafe

Fix NameError: List is not defined in orchestrator.py

V285.5: Multi-image ordering implementation and pedagogical grading logic

V5.10.1: Added 'המצאה', 'טעות שלי', 'מתנצל' to Blacklist & Verified 4 Layers

feat(backend): V281.0 - Vision-First OCR, Visuals robustness (Pow fix), and Rigid Graph Identification

V280.0: Robust Math Validation Fixes & Model Lockdown (RCE Protection, Multiline Regex, Soft Fail)

QA Cycle 2.1: Data Slicing, Hotfix refinement, Firestore fix, and UI Safety updates

Critical QA Fixes: Bug 1-4 (Data Isolation, Hotfix Sanity, History Save, Visuals Stability)

V5.10.4: History Tier Fix (admin_unlimited) & Vision Extractor Graph Descriptions

V5.10.3: History Debugging & Graph Anti-Hallucination Prompt Fix

V5.10.2: Fix kwargs collision in smart_solve - pop explicit keys before spread

Implement SymPy Algebraic Verification & Self-Correction - Resolved critical regression and auth

Fix Digital Binder history saving - Parameter propagation & logging

Implement Digital Binder (History) - Conditional saving for premium users

feat: Implement Check Solution logic with score and structured mistakes

feat: AI Assessment Analytics Infrastructure

feat: multi-image support for V2 endpoint

V309.5: Rollback to HOTFIX + OCR Anti-Truncation + Abs Fix

V307.0: Polygraph Restore + Math Syntax Pre-processor + Graph Polish Sync

Hotfix: SymPy Parse Error bypass

V5.8.5: Enhanced 5-unit math (3D Vectors, Solid Geom, Optimization) + Placeholder Fixes + HF Space compatibility

Fix: Clean production deployment with sse-starlette