the step is gradient descent.loss, gradient, an adaptive learning rate with warmup and a cap. the arithmetic that trains a neural network, pointed at your week instead of at a model. one optimizer iteration a day.
the familiar is a neural network.a neural cellular automaton, ~6 000 weights, 16 channels, 64 hidden units, trained once with pytorch. ships as weights.json, runs in pure python, no torch at runtime.
your ai agent is the interface.claude code, codex or cursor talk to basin over mcp. the agent logs your day from a sentence, says hello with the step and feeds the familiar. basin itself calls no llm and needs no api key.