qector-space-time

Space-time and streaming decoding for QECTOR. Covers the (2+1)D detector lattice, the detector-difference formulation d_{c,t} = s_{c,t} xor s_{c,t-1}, the space-time lifting theorem (manual 10.2), the streaming primitives (OR-accumulated history, exponentially decayed window), the truncation bound ||S_W — S_inf||_1 <= lambda^W / (1 — lambda) * ||s||_inf, and the Python layer's "decode per round" scope (manual 10.3).…