P4: real mask chain in FramedDetector (level-tracker + accumulator + live-calibrated LUT), t1kq err 0.5dB

Replace empirical PCHIP detector with live-calibrated mask chain from FUN_180529fe0:
  level = am*res*scale; track += w*(level-track) (per-bin attack/release weights
  extracted from RT snapshot, rt_weights.hpp); acc = (level-track)+level; mask =
  (1/(1+K*acc))^n (K=9.8026 n=0.25966 fitted to live mask band0). min-combine.

Results (N=2048 hop=512): t1kq single-band err +0.51 dB (-14.47 vs -14.98 dB ref);
comb 4-band per-tone -3.4..+5.8 dB (old PCHIP over-cut comb ~6 dB). Adds framed_test
harness for C++ FramedDetector eval on tone1kq/comb.

dsp/CMakeLists.txt

@@ -22,9 +22,11 @@ add_library(soothe2_dsp SHARED
     vlog.cpp
     leveltrack.cpp
     framed_model.cpp
+    rt_weights.cpp
 )
 
 add_executable(soothe2_harness harness.cpp)
+add_executable(framed_test framed_test.cpp)
 add_executable(twin_check twin_check.cpp)
 add_executable(tables_check tables_check.cpp)
 add_executable(fftconv_check fftconv_check.cpp)
@@ -32,6 +34,7 @@ add_executable(vlog_check vlog_check.cpp)
 add_executable(leveltrack_check leveltrack_check.cpp)
 add_executable(levelpath_check levelpath_check.cpp)
 target_link_libraries(twin_check soothe2_dsp)
+target_link_libraries(framed_test soothe2_dsp)
 target_link_libraries(tables_check soothe2_dsp)
 target_link_libraries(fftconv_check soothe2_dsp)
 target_link_libraries(vlog_check soothe2_dsp)