feat: Implement Check Solution logic with score and structured mistakes

Security Hardening: Firebase Auth + Quota V2 Enforcement

feat: token pipeline and device fingerprinting

feat: Payment Page integration and Rebranding to המורה למתמטיקה

feat: Parent Report Engine (HTML to PDF) and SendGrid Delivery

feat: AI Assessment Analytics Infrastructure

feat: multi-image support for V2 endpoint

Merge user security changes

V310.0: OCR Visual Disambiguation Fix (1 vs a)

V309.6: FINAL STABILITY Restored (HOTFIX + Correct Regex + OCR Fix)

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

V308.0: latex2sympy2 Integration + Procedural Bypass + Abs Fix

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

V306.0: SVG Pad Optimization + OCR Rigor (1 vs 3)

V305.0: Final Graph Aesthetics + Protocol Alignment

V5.8.6: Signed URLs, math improvements, and orchestrator refinements

Hotfix: SymPy Parse Error bypass

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

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

Fix: Move debug and log directories to /tmp for Hugging Face compatibility

Fix: Add Hugging Face metadata via README.md

Fresh surgical release (v1.2.3) - Code Only

Fix: Clean production deployment with sse-starlette