System Spec Brainstorm

Create a high-level System Spec from a user brain-dump. The document should be strategic enough to avoid premature implementation detail, but concrete enough that each subsystem can later be designed and implemented in an isolated AI coding session.

Core principle: Model the system as a composition of functions. Each subsystem is an independently testable unit with explicit inputs, outputs, and contracts. Dependencies are allowed, but coupling must flow through named contracts rather than hidden implementation knowledge.

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