fix: swap _v/_h dispatch fn selection — naming refers to filter direction not edge direction

src/daedalus_decoder.c

@@ -298,21 +298,27 @@ static int dispatch_deblock_pass(
         uint8_t *, size_t, size_t,
         const daedalus_h264_deblock_meta *);
 
+    /* daedalus-fourier kernel naming convention:
+     *   _v = "v_loop_filter" — filter applied VERTICALLY across a
+     *        HORIZONTAL edge.  Use for our orient=1 (H edge).
+     *   _h = "h_loop_filter" — filter applied HORIZONTALLY across a
+     *        VERTICAL edge.  Use for our orient=0 (V edge).
+     * The names refer to the FILTER DIRECTION, not the edge direction. */
     deblock_dispatch_fn fn;
     if (target_plane == 0) {
-        if (target_orient == 0)
+        if (target_orient == 0)  /* V edge → h_loop_filter */
-            fn = target_bS_intra ? daedalus_dispatch_h264_deblock_luma_v_intra
-                                 : daedalus_dispatch_h264_deblock_luma_v;
-        else
             fn = target_bS_intra ? daedalus_dispatch_h264_deblock_luma_h_intra
                                  : daedalus_dispatch_h264_deblock_luma_h;
+        else                      /* H edge → v_loop_filter */
+            fn = target_bS_intra ? daedalus_dispatch_h264_deblock_luma_v_intra
+                                 : daedalus_dispatch_h264_deblock_luma_v;
     } else {
         if (target_orient == 0)
-            fn = target_bS_intra ? daedalus_dispatch_h264_deblock_chroma_v_intra
-                                 : daedalus_dispatch_h264_deblock_chroma_v;
-        else
             fn = target_bS_intra ? daedalus_dispatch_h264_deblock_chroma_h_intra
                                  : daedalus_dispatch_h264_deblock_chroma_h;
+        else
+            fn = target_bS_intra ? daedalus_dispatch_h264_deblock_chroma_v_intra
+                                 : daedalus_dispatch_h264_deblock_chroma_v;
     }
 
     return fn(dec->dctx, sub, scratch, stride, n, meta_scratch);