fix: make getcwd report truncated buffers as ERANGE

kernel/src/Api/Process.hpp

@@ -165,10 +165,15 @@ namespace montauk::abi {
         if (proc == nullptr || buf == nullptr || maxLen == 0) return -1;
 
         const char* cwd = proc->cwd[0] ? proc->cwd : "0:/";
-        int i = 0;
-        for (; i < (int)maxLen - 1 && cwd[i]; i++) buf[i] = cwd[i];
-        buf[i] = '\0';
-        return i;
+        uint64_t cwdLen = 0;
+        while (cwd[cwdLen] != '\0') cwdLen++;
+
+        // Reserve -1 for non-size failures so libc can distinguish them
+        // from a buffer that can be retried with a larger allocation.
+        if (maxLen <= cwdLen) return -2;
+
+        for (uint64_t i = 0; i <= cwdLen; i++) buf[i] = cwd[i];
+        return (int)cwdLen;
     }
 
     // ====================================================================