Figure 2: SCLE only modifies the pre-decoder selection stage of the language-guided detector. Left: detection pipeline, where SCLE-driven query selection replaces text-score ranking before the HED decoder. Upper right: class-wise foreground prototypes and one shared background prototype, updated by exponential moving average from labeled support samples. Lower right: the prototype bank produces a class-agnostic evidence map. Candidates are scored using interior purity P_i, ring evidence R_i, and contrast C_i. A quota divides the Top-900 budget into semantic, local-evidence and joint channels. Only the indices fed into the decoder are changed.