优化 Jacobian 确定性复用并补充性能剖析与平台依赖文档

在单次 Jacobian 构建内按完整输入精确复用储气物性、PH 反算、密度和管路求根结果，保持原有求值副作用、差分政策与失败回退。八路模型求解 CPU 中位数减少 19.27%，循环和不循环的完整原始采样均与恢复基线一致。

增加独立的跨平台时间剖析工具，记录互斥阶段耗时、Newton/LU 统计、矩阵复用与内核复用，保存 UD00 两种工况的调查报告和机器可读汇总。

补充 Windows/Linux 运行、测试、原生编译和剖析所需依赖文档及索引，不修改依赖清单、版本锁或安装环境。

验证：8 项新增专项回归通过；2270 次完整 Jacobian 核对零差异；16 次剖析配对及预热运行保持完整数值一致。既有固定样本哈希失败和 Linux 实机验收限制见报告。

native/include/kernels.h

@@ -1,6 +1,7 @@
 #ifndef NATIVE_KERNELS_H
 #define NATIVE_KERNELS_H
 #include <stddef.h>
+#include <stdint.h>
 typedef struct { double p, T, rho, u, h; } NativeGas;
 typedef struct {
     int velocity_index;
@@ -27,6 +28,7 @@ enum {
 /* Optional observer for one evaluation, independent of cache capacity.
  * Slots: EOS, ideal caloric data, dynamic viscosity; each has min/max T. */
 #define NATIVE_PROPERTY_DOMAINS 3
+typedef struct NativeJacobianScalars NativeJacobianScalars;
 typedef struct {
     unsigned seen;
     double minimum[NATIVE_PROPERTY_DOMAINS], maximum[NATIVE_PROPERTY_DOMAINS];
@@ -36,16 +38,49 @@ typedef struct {
     double p, T, h, rho, mu, isentropic_factor, isentropic_exponent;
     unsigned valid;
     NativePropertyTemperatures *temperatures;
+    NativeJacobianScalars *jacobian;
 } NativePropertyState;
 typedef struct {
     NativePropertyState *states;
     size_t count, capacity;
     NativePropertyTemperatures *temperatures;
+    NativeJacobianScalars *jacobian;
 } NativePropertyCache;
 void native_properties_init(NativePropertyCache *, NativePropertyState *, size_t capacity);
 int native_gas_context(NativePropertyCache *, double m, double U, double V, NativeGas *);
 int native_medium_gas_context(NativePropertyCache *, const NativeMedium *, double m, double U, double V, NativeGas *);
 int native_polytropic_gas_context(NativePropertyCache *, const NativeMedium *, double mass, double T, double V, NativeGas *);
+/* Immutable baseline entries owned by ONE Jacobian construction. These
+ * reviewed kernels are deterministic with a NULL property cache: no cache
+ * seeds or temperature observations may be suppressed by a hit. */
+typedef int (*NativeCanonicalGas)(NativePropertyCache *,const NativeMedium *,double,double,double,NativeGas *);
+typedef struct {
+    NativeCanonicalGas kernel;
+    double inputs[10]; /* mass, thermal state, volume, and every medium double */
+    NativeGas value;
+    int medium_kind, valid;
+} NativeJacobianGasMemo;
+typedef struct { unsigned long evaluations, reuses; } NativeJacobianGasStats;
+int native_jacobian_gas(NativeJacobianGasMemo *,NativeCanonicalGas,const NativeMedium *,
+                        double mass,double thermal,double volume,NativeGas *,NativeJacobianGasStats *);
+enum { NATIVE_JACOBIAN_PH, NATIVE_JACOBIAN_DENSITY, NATIVE_JACOBIAN_PIPE, NATIVE_JACOBIAN_SCALAR_KINDS };
+#define NATIVE_JACOBIAN_SCALAR_KEYS 10
+typedef struct {
+    uint64_t hash;
+    double inputs[NATIVE_JACOBIAN_SCALAR_KEYS], value;
+    int kind, medium_kind;
+    size_t input_count;
+} NativeJacobianScalarEntry;
+struct NativeJacobianScalars {
+    NativeJacobianScalarEntry *entries;
+    size_t capacity; /* power of two; zero disables the optional cache */
+    int recording;
+    unsigned long evaluations[NATIVE_JACOBIAN_SCALAR_KINDS], reuses[NATIVE_JACOBIAN_SCALAR_KINDS];
+};
+int native_jacobian_scalar_get(NativeJacobianScalars *,int kind,int medium_kind,
+                               const double *inputs,size_t count,double *value);
+void native_jacobian_scalar_put(NativeJacobianScalars *,int kind,int medium_kind,
+                                const double *inputs,size_t count,double value);
 double native_temperature_ph_context(NativePropertyCache *, const NativeMedium *, double p, double h);
 double native_density_context(NativePropertyCache *, const NativeMedium *, double p, double T);
 int native_orifice_context(NativePropertyCache *, double p1, double p2, double h1, double h2,