v0.5.5

Add broader MATLAB compatibility across I/O, signal processing, optimization, symbolic math, plotting, control systems, and array construction, including xlsread, writecell, textscan, importdata, uiputfile, unzip, imwrite, audioread, audioinfo, pwelch, periodogram, spectrogram, freqz, filtfilt, fir1, buttord, envelope, zplane, pskmod, lsqcurvefit, fminunc, quad, digits, vpa, int, nan, inf, zero, damp, and polarplot. Add MAT-file save/load coverage, including append workflows, and expand spreadsheet/text import/export paths through provider-backed filesystems. Add resident GPU execution paths for complex math, signal, communication, modulation, Hilbert, gradient, reshape, meshgrid, polynomial integration, gamma, sinc, sign, and trigonometric workflows. Expand GPU acceleration plumbing with dedicated WGPU shader modules for signal and communications workloads, complex tensor residency, and shared provider APIs. Improve plotting and scene export behavior, including async replay/export handling, image export ownership, geometry renderer grid toggles, colormap command syntax, and portable rendering metadata