按源验证非随机刀表保存边界

源依据：LinuxCNC src/emc/tooldata/tooldata_common.cc 的 tooldata_save() 在 DB_NOTUSED 下按 is_random_toolchanger 选择起始 pocket；非随机换刀器从 pocket 1 开始写出，跳过 spindle pocket 0。

结论：wasm-safe tooldata_common standalone probe 增加非随机保存断言，确认 pocket 0 的 spindle-only 数据不会写入普通刀表，同时 pocket 1 的真实刀具仍会保存，减少 tooldata_common/mmap 后端替换风险。

检查：./test-linuxcnc-wasm-tooldata-common-link.sh；./test-native.sh；./test-linuxcnc-source-link.sh。

core/wasm_shims/tooldata/tooldata_common_probe_main.cc

@@ -123,6 +123,47 @@ int main() {
         nonrandom_spindle.offset.tran.z != 4.25) {
         return 20;
     }
+    CANON_TOOL_TABLE spindle_only = tooldata_entry_init();
+    spindle_only.toolno = 99;
+    spindle_only.pocketno = 0;
+    spindle_only.offset.tran.z = 9.0;
+    if (tooldata_put(spindle_only, 0) != IDX_OK) {
+        return 21;
+    }
+    CANON_TOOL_TABLE saved_nonspindle = tooldata_entry_init();
+    saved_nonspindle.toolno = 7;
+    saved_nonspindle.pocketno = 5;
+    saved_nonspindle.offset.tran.z = 4.25;
+    if (tooldata_put(saved_nonspindle, 1) == IDX_FAIL) {
+        return 26;
+    }
+    std::string nonrandom_save_template = make_temp_template("cnc_tooldata_common_nonrandom_save_XXXXXX");
+    std::vector<char> nonrandom_save_path(nonrandom_save_template.begin(), nonrandom_save_template.end());
+    nonrandom_save_path.push_back('\0');
+    const int nonrandom_save_fd = mkstemp(nonrandom_save_path.data());
+    if (nonrandom_save_fd < 0) {
+        return 22;
+    }
+    close(nonrandom_save_fd);
+    // LinuxCNC source basis: src/emc/tooldata/tooldata_common.cc saves
+    // nonrandom tool tables starting at pocket 1, so spindle pocket 0 is not
+    // emitted unless DB_ACTIVE selects the one-entry spindle save path.
+    if (tooldata_save(nonrandom_save_path.data()) != 0) {
+        std::remove(nonrandom_save_path.data());
+        return 23;
+    }
+    FILE *nonrandom_save_fp = std::fopen(nonrandom_save_path.data(), "r");
+    if (!nonrandom_save_fp) {
+        std::remove(nonrandom_save_path.data());
+        return 24;
+    }
+    char nonrandom_saved[CANON_TOOL_ENTRY_LEN * 2] = {};
+    std::fread(nonrandom_saved, 1, sizeof(nonrandom_saved) - 1, nonrandom_save_fp);
+    std::fclose(nonrandom_save_fp);
+    std::remove(nonrandom_save_path.data());
+    if (std::strstr(nonrandom_saved, "T99") || !std::strstr(nonrandom_saved, "T7")) {
+        return 25;
+    }
 
     tooldata_init(true);
     tooldata_set_db(DB_ACTIVE);