X72-33: Signed-Source Cancellation Renormalization

Picks up STOP-C36 from Round 32 — the positive parts of determinant, Q-growth, and pair-kernel sources cannot be controlled by the Fisher mechanism — and, instead of forcing sources to be positive, builds a lossless accounting system for signed sources via a Jordan decomposition (M_W, V_W, cancellation coefficient c_W). Proves that positive sources admit a Jordan reconstruction, that determinant interfaces can be renormalized by a Kato-type method, and that even Calderón–Zygmund pair kernels can be renormalized by second-order differencing and are locally finite under this regularity — but the original positive-part pair source is itself not lossless. This motivates the Cancellation-First Principle; STOP-C37 (Signed-Variation/Cancellation-Renormalization Budget Gap) hands the study of cancellation-budget dynamics to the next round.