feat: deterministic noise generators - #71
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Adds Image::add_gaussian_noise(seed, sigma) and Image::add_salt_pepper(seed, density), driven by a 64-bit LCG (Knuth MMIX constants) so a given seed reproduces the identical image on every backend. Gaussian deviates use the CLT sum-of-12 approximation (branch-free); noise is gray per pixel to avoid color fringes. 6 new tests: seed determinism, seed divergence, zero-mean sanity on mid-gray, sigma/density 0 exact copies, density accounting with both salt and pepper present, and the classic median-cleans-impulse-noise pairing (>=75% removed). 163/163 tests on wasm-gc and js. Closes #68