هیدرودینامیکی انبساط و بسته جامع پاسخ به نقدهای داوری در مدل Etc)

This unified technical report presents the hydrodynamical engine of Environmental Transition Cosmology (ETC) alongside a systematic defense addressing peer-review critiques. The first section details momentum-driven cosmic expansion, energy channelling via environmental tunnels, and hydrodynamic flux equations operating strictly without dark energy (Λ≡0Λ ≡ 0Λ≡0). The second section provides rigorous, point-by-point responses to referee evaluations regarding primordial node stability, acoustic speed bounds (cs2≤c2c_s^2 ≤ c^2cs2≤c2), SPARC galactic rotation curve fits, and emergent spatial flatness (Ωk≈0Ω_k ≈ 0Ωk≈0). This combined monograph serves as a self-contained theoretical and defensive milestone for the ETC framework.