Trace-Insensitive Gravity and Vacuum-Shift Invariance

A conceptual educational note exploring trace-insensitive (traceless-source) gravitational coupling as a reframing target for the vacuum energy problem. Offered for discussion and inquiry, not as a claim of final results.

This material is provided for educational and discussion purposes only. No claims of completeness, correctness, or physical finality are made. Readers are encouraged to consult primary sources and qualified experts.