docs: Session 8 final — compile fixes, architecture diagram, expected test count

docs: Session 8 — custom node creator full system summary

docs: Session 7 handoff — .nfl format, file I/O, File menu, wgpu architecture clarification

docs: Session 6 final — 90/90 exec coverage achieved, 174 tests

docs: Session 6 handoff — 84/90 exec, 11 new kernels, 171 tests

docs: Session 5 handoff summary

docs: Session 4 handoff — run_forward, exec kernels, coverage audit, RunPanel UI, 150 tests