RCA Ω 2027 — Phase VI: CMB-Constrained Minimal Interaction Validation

Phase VI of the RCA Ω 2027 project documents the minimal-interaction validation stage under strict CMB distance prior constraints.This release is not intended to optimize cosmological tension resolution. Instead, it provides a transparent audit of how a time-independent RCA coupling behaves when early-universe geometry is fully enforced.The results demonstrate that the minimal RCA framework does not produce instabilities or artificial parameter tuning under CMB constraints, but instead reduces smoothly toward ΛCDM-like behavior. This reduction defines the physical boundary of applicability for time-independent RCA interactions.The archive contains full source code, configuration files, MCMC chains, logs, and reproducibility metadata. All results can be regenerated from initialization to final chain using the provided materials.No post-hoc parameter rescue, selective filtering, or retrospective optimization has been applied. This archive represents the exact Phase VI validation state as executed.Phase VI serves as the consistency anchor for subsequent late-time activation studies developed in Phase VII.RCA Ω 2027项目的第六阶段记录了严格宇宙微波背景（Cosmic Microwave Background, CMB）距离先验约束下的最小相互作用验证阶段。本次发布并非旨在优化宇宙学张力的解决效果，反而针对早期宇宙几何结构被完全约束时，与时间无关的RCA耦合项的行为表现，提供了透明的核查验证。研究结果表明，在CMB约束下，最小RCA框架不会产生不稳定性或人为参数调优问题，反而会平滑地趋近于类Λ冷暗物质（ΛCDM）的行为模式。这一趋近过程界定了与时间无关的RCA相互作用的物理适用边界。本存档包含完整源代码、配置文件、马尔可夫链蒙特卡洛（Markov Chain Monte Carlo, MCMC）链、日志文件以及可复现性元数据。依托本次发布的材料，可从初始化阶段直至最终MCMC链生成的全过程复现所有研究结果。本次发布未采用事后参数修正、选择性筛选或回溯性优化手段，完整还原了实际执行的第六阶段验证的原始状态。第六阶段为第七阶段中开展的后续晚期宇宙激活研究提供了一致性锚定基准。