D-SIG: Distilled Signal Standard v0.5 — An Architectural Blueprint for Digital Vitality Signals

D-SIG (Distilled Signal) is an open architectural framework for producing, transmitting, and consuming unified vitality signals in distributed systems. It specifies a Triple-Reduction signal (normalised score 0–100, semantic label, colour code, and temporal trend) derived from the convergence of independent producer perspectives (LOCAL/CENTRAL/EXTERNAL). v0.5 introduces two formal emergent properties — the Prusik Principle (self-reinforcing Byzantine resistance) and the Pheromone Principle (cumulative trust through convergence history) — and resolves three internal inconsistencies from peer review: label/trend independence (Rule 10), baseline_cycles circularity (receiver-computed, Rule 9 revised), and the precondition dimension concept (Rule 11). D-SIG is a compositional innovation through interdisciplinary transfer, applying composite indicator architectures from algorithmic trading (RSI, MACD) to IT observability. The framework is implementation-agnostic. NetPulse is the reference implementation. All documented limits (oracle problem, single-anchor invariant) are explicitly stated. This paper is a position paper and architectural blueprint, not a prescriptive standard. It is released under CC0 — No Rights Reserved.