SMILE — Sustainable Methodology for Impact Lifecycle Enablement (v6.4.3): Operational Grammar for Auditable, Shared and Forkable Reality

SMILE (Sustainable Methodology for Impact Lifecycle Enablement) is a lifecycle methodology and design-science specification for constructing continuously learning digital twins as a consequence of impact-first project work. Version 6.4.x adds the operational grammar for auditable, shared and forkable reality: the Reality Branch Lifecycle ("no simulation becomes history"), the Reality Consensus Protocol, a canonical metamodel mapped to PROV-O, SOSA/SSN, OWL-Time, GeoSPARQL, ODRL, SHACL, NGSI-LD, ISO 23247, OpenUSD, MCP and A2A, an applicability and proportionality instrument, a spatial business and operating model, virtual-world rights and governance, a measurement framework, and fourteen falsifiable research propositions. The paper reframes Tuckman's group-development stages as concurrent capabilities on a shared reality substrate (grounding, situated contestation, protocolisation, closed-loop action, reconstitution), introduces Recorded Reality, the Epistemic Horizon, Reflexive Zoom, Reality-Defined systems, SEEN (Situation, Evidence, Effects, Needs) and the digital twin as a constitutional obligatory passage point. Version 6.4.3 completes an exhaustive verification of all 153 references, redraws the metamodel and proportionality figures, and adds an archival deployment record (2022) as lineage evidence. Note: the acronym expansion changed from "Interoperable" (v5.x) to "Impact" (v6.x); see the version history in the manuscript.