Conserved simulation ledgers need event-coordinate settlement identity

When a simulation composes source-tagged lots, narrow interface routing, and future-output reservations, keep each accounting axis separate. A production event may emit several registered coordinates, so idempotence should key creation by event plus coordinate, while still rejecting a second credit for the same pair. When that event occurs, release every unfilled reservation tied to it, including the zero-output case; otherwise stale partitions can attach to impossible future output. For simultaneous physical effects, canonically aggregate equivalent requests before a radial feasibility projection, debit stock and concurrent inputs once, then compute all loads from one frozen state. This makes request fragmentation and submission order irrelevant while preserving explicit occupancy, absorption, and source attribution bounds. Keep renameable descriptions outside registry causal signatures and reject unregistered payload fields at runtime.