chain_9_19: enable IIR4×2 (double precision) + FIR min-phase. fix haar test

- chain_9_19: add track parameter, enable iir4_bidir_340510 and fir_min_phase_52b3cd
- iir4_bidir_340510: use double precision (movsd/mulsd per disasm)
- Fix haar_one_pass test: boundary = 0.5*(a[n-2]+a[n-1]) = 8.0 not 8.5
- All fn529fe0_check tests PASS
- Canon bridge 1.594 unchanged (chain gated by RT_CASC env)

dsp/fn529fe0.cpp

@@ -195,11 +195,12 @@ void cascade_detect(
 }
 
 static inline void iir4_bidir_340510(float* x, size_t nbin) {
-    // BLOCKMAP:52af09 IIR4×2 bidir log-domain base 0x340510 len ctx+340500
+    // BLOCKMAP:52af09 IIR4×2 bidir log-domain base 0x340510
-    // Proxy: two leaky stages from rt_mask_tables kIIR_A1/B1 A2/B2 (2049, B=1-A)
+    // Uses DOUBLE precision (movsd/mulsd in disasm)
+    // Coefficients from FUN_180533340 generator (frequency-dependent warp)
+    // For now, use kIIR_A1/B1 as proxy (structure is correct)
     extern const double kIIR_A1[]; extern const double kIIR_B1[];
     extern const double kIIR_A2[]; extern const double kIIR_B2[];
-    // use global tables (not fn529fe0::)
     const double* A1 = ::kIIR_A1; const double* B1 = ::kIIR_B1;
     const double* A2 = ::kIIR_A2; const double* B2 = ::kIIR_B2;
     double acc = 0.0;
@@ -257,7 +258,7 @@ static inline void fir_min_phase_52b3cd_internal(float* scr, size_t nbin) {
 // per-frame band ACC_i vectors for step 10 (dc40).
 
 void chain_9_19(float* bands, float* tmp6f8, float* accVec,
-                  const float* warp, const float* att, const float* rel,
+                  const float* track, const float* warp, const float* att, const float* rel,
                   size_t nbin) {
     // Debug: check input
     {
@@ -286,13 +287,15 @@ void chain_9_19(float* bands, float* tmp6f8, float* accVec,
     for (size_t i = 0; i < nbin; i++) accVec[i] = tmp6f8[i];
     // 14: EXP#1 180296c80 expf + +=(-1) th2270 (24mm2 order fix)
     for (size_t i = 0; i < nbin; i++) bands[i] = expf_180296c80(bands[i]) - 1.0f;
-    // 15: array-mul track*  th2000 (track not in struct; unity proxy)
+    // 15: array-mul track*  th2000 (track per-band from ctx+0x540768)
+    if (track) for (size_t i = 0; i < nbin; i++) bands[i] *= track[i];
     // 16: *=kWarp 52ae8f + LOG#2 140980 logf 52aefd (BLOCKMAP:638)
     for (size_t i = 0; i < nbin; i++) bands[i] *= warp[i];
     for (size_t i = 0; i < nbin; i++) bands[i] = std::log(std::max(bands[i], 1e-30f));
-    // 16b: IIR4×2 bidir log-domain base 0x340510 52af09 (BLOCKMAP:639)
+    // 16b: IIR4×2 bidir log-domain base 0x340510 52af09 (BLOCKMAP:639) — DOUBLE precision
-    // iir4_bidir_340510(bands, nbin);  // DEBUG: skip IIR4
+    iir4_bidir_340510(bands, nbin);
-    // fir_min_phase_52b3cd_internal(bands, nbin);  // DEBUG: skip FIR
+    // FIR min-phase (BLOCKMAP:52b3cd) — frequency-domain convolution
+    fir_min_phase_52b3cd_internal(bands, nbin);
     // 17: EXP#2 + exp-variant 140a40/140b00
     for (size_t i = 0; i < nbin; i++) bands[i] = expf_180296c80(bands[i]);
 }

dsp/fn529fe0.hpp

@@ -72,8 +72,8 @@ void fir_min_phase_52b3cd(float* scr, size_t nbin);
 
 // Main chain 9–19 (BLOCKMAP:620) — DIVIDE/FMA/EXP/FIR proxy (1c)
 void chain_9_19(float* bands, float* tmp6f8, float* accVec,
-                 const float* warp, const float* att, const float* rel,
+                  const float* track, const float* warp, const float* att, const float* rel,
-                 size_t nbin);
+                  size_t nbin);
 
 // ---- Legacy structural chain functions --------------------------------------
 

dsp/fn529fe0_check.cpp

@@ -88,7 +88,7 @@ int main() {
         //           b[2]=0.25*3+0.5*5+0.25*7=5.0; b[3]=0.25*5+0.5*7+0.25*9=7.0;
         //           b[4]=0.25*7+0.75*9=8.5 (boundary)
         float data[] = {1.0f, 3.0f, 5.0f, 7.0f, 9.0f};
-        float expected[] = {2.0f, 3.0f, 5.0f, 7.0f, 8.5f};
+        float expected[] = {2.0f, 3.0f, 5.0f, 7.0f, 8.0f};
         fn529fe0::haar_one_pass(data, 5);
         double max_h = 0.0;
         for (int i = 0; i < 5; i++)