Architecture contributions

The implemented execution line is:

CSV -> data/profile/derivative/features -> sparse discovery -> World -> bundle -> simulation

Keep validation at boundaries. lawsynth-core owns common identifiers, hashing, diagnostics, cancellation, and resources; expression, units, data, World, simulator, bundle, and discovery crates compose the local engine. The CLI and Python extension call those same crates rather than duplicating their semantics.

Changes to a World, expression, or bundle format require compatibility tests and explicit version handling. The current canonical bundle encodes scalar continuous/discrete Worlds only. Do not claim support for events, regimes, stochastic terms, delays, custom calls, signatures, or causal metadata until the IR, serialization, validation, and executor all implement it.