As operators expand across mobile, FTTH/FWA, transport, and core domains, network planning remains fragmented—driving duplicated CapEx, inefficient asset utilization, and slow, siloed decision-making. This project addresses that challenge by introducing a multi-agent, intent-driven investment orchestration framework that unifies end-to-end planning and transforms how CSPs decide where, when, and how to invest. Building on previous phases, Phase III extends the solution into a cross-domain, AI-powered decision layer that evaluates thousands of rollout scenarios simultaneously, quantifying trade-offs across cost, coverage, and customer experience. By incorporating TM Forum Autonomous Network standards—TMF921 (Intent), TMF785 (Copilot), and TMF939 (Agent APIs)—the Catalyst pioneers a multi-agent architecture where business intents guide optimization, AI agents collaborate to generate investment strategies, and human experts remain in the loop to ensure transparency, governance, and trust. This unified, explainable intelligence allows operators to understand interdependencies across RAN, fiber, and transport networks, unlocking 10–20% CapEx savings, accelerated rollout planning, and measurable improvements in customer experience and ROI. The solution shifts investment planning from a static engineering exercise to a strategic, data-driven process that aligns technical and financial outcomes and advances operators toward intent-driven, autonomous, and financially optimized networks.