refactor(compress): remove pure C parameter forwarders

Call the existing Rust parameter leaves directly from the compression
orchestration layer. This removes the redundant dedicated-dictionary
parameter reversal, C-parameter equality, and advanced CCtx-parameter
allocation wrappers while keeping all private context/resource callbacks and
debug assertion behavior in place.

Test Plan:
- clang -fsyntax-only on lib/compress/zstd_compress.c
- git diff --check
- Full capped native/upstream suite pending after this commit

lib/compress/zstd_compress.c

@@ -3579,15 +3579,9 @@ static ZSTD_CCtx_params ZSTD_makeCCtxParamsFromCParams(
     return cctxParams;
 }
 
-static ZSTD_CCtx_params* ZSTD_createCCtxParams_advanced(
-        ZSTD_customMem customMem)
-{
-    return ZSTD_rust_createCCtxParams(customMem);
-}
-
 ZSTD_CCtx_params* ZSTD_createCCtxParams(void)
 {
-    return ZSTD_createCCtxParams_advanced(ZSTD_defaultCMem);
+    return ZSTD_rust_createCCtxParams(ZSTD_defaultCMem);
 }
 
 size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params)
@@ -3789,9 +3783,6 @@ size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSr
                                        &cctx->pledgedSrcSizePlusOne);
 }
 
-static void ZSTD_dedicatedDictSearch_revertCParams(
-        ZSTD_compressionParameters* cParams);
-
 size_t ZSTD_CCtx_loadDictionary_advanced(
         ZSTD_CCtx* cctx,
         const void* dict, size_t dictSize,
@@ -4220,12 +4211,6 @@ size_t ZSTD_toFlushNow(ZSTD_CCtx* cctx)
     return ZSTD_rust_toFlushNow(&state);
 }
 
-static void ZSTD_assertEqualCParams(ZSTD_compressionParameters cParams1,
-                                    ZSTD_compressionParameters cParams2)
-{
-    ZSTD_rust_params_assertEqualCParams(cParams1, cParams2);
-}
-
 void ZSTD_reset_compressedBlockState(ZSTD_compressedBlockState_t* bs)
 {
     ZSTD_rust_resetCompressedBlockState(bs);
@@ -4922,7 +4907,9 @@ static size_t ZSTD_rust_resetCCtx_byAttachingCDict_reset(
     /* Resize working context table params for input only, since the dict
      * has its own tables. */
     if (cdict->matchState.dedicatedDictSearch) {
-        ZSTD_dedicatedDictSearch_revertCParams(&adjusted_cdict_cParams);
+        adjusted_cdict_cParams =
+                ZSTD_rust_params_dedicatedDictSearch_revertCParams(
+                        adjusted_cdict_cParams);
     }
     params.cParams = ZSTD_adjustCParams_internal(
             adjusted_cdict_cParams, pledgedSrcSize,
@@ -5466,7 +5453,8 @@ static void ZSTD_rust_buildSeqStore_prepareMatchState(void* context,
     DEBUGLOG(5, "ZSTD_buildSeqStore (srcSize=%zu)", srcSize);
     (void)srcSize;
     /* Assert that we have correctly flushed the ctx params into the ms's copy. */
-    ZSTD_assertEqualCParams(zc->appliedParams.cParams, ms->cParams);
+    ZSTD_rust_params_assertEqualCParams(zc->appliedParams.cParams,
+                                        ms->cParams);
     /* required for optimal parser to read stats from dictionary */
     ms->opt.symbolCosts = &zc->blockState.prevCBlock->entropy;
     /* tell the optimal parser how we expect to compress literals */
@@ -6114,7 +6102,7 @@ static void ZSTD_loadDictionaryContent_assertCParams(void* opaque)
 {
     ZSTD_loadDictionaryContent_context const* const context =
             (const ZSTD_loadDictionaryContent_context*)opaque;
-    ZSTD_assertEqualCParams(context->params->cParams,
+    ZSTD_rust_params_assertEqualCParams(context->params->cParams,
                                         context->matchState->cParams);
 }
 
@@ -8641,16 +8629,6 @@ size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
 /* The compression-level tables (formerly included from clevels.h) live in
  * rust/src/zstd_compress_params.rs. */
 
-/**
- * Reverses the adjustment applied to cparams when enabling dedicated dict
- * search. This is used to recover the params set to be used in the working
- * context. (Otherwise, those tables would also grow.)
- */
-static void ZSTD_dedicatedDictSearch_revertCParams(
-        ZSTD_compressionParameters* cParams) {
-    *cParams = ZSTD_rust_params_dedicatedDictSearch_revertCParams(*cParams);
-}
-
 /*! ZSTD_getCParams_internal() :
  * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
  *  Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.