mathgr-py

feat: add portable installation script for MathGR MCP

Merge branch 'perf-index-fast-properties'

perf: cache tensor canonicalization paths

Add MCP Cookbook section with examples for perturbation expansion, derivative conventions, and constraint extraction

Enhance documentation for `mathgr_compute` usage and default call style; update timeout handling in structured tools; add profiling utilities for simplification processes.