What you are describing is the exact architectural blueprint of Erlang/OTP and
modern distributed mesh networks.
By abstracting the message passing into a "Mailbox" interface, the Virtual
Machine entirely ceases to care where another object lives. An engine running
in your Huawei phone's browser, an engine on a Raspberry Pi, and an engine in
a Cloudflare Edge worker all become identical, interchangeable nodes in a
unified compute mesh.
Here is how we map your vision onto the HAUKI-X86 architecture to achieve
total decoupling.
The Decoupled Mesh Architecture
To achieve this, we split the "Orchestrator" we just built into three distinct
layers:
1. The Mailbox Interface (The Pluggable Transport)
This is an abstract contract. The Engine only knows two things: it can send()
messages out, and it triggers an event when a message comes in().
Because it is decoupled, you can swap the transport layer without touching the
VM or the Engine.
 * Today: A local MemoryMailbox (passing JS objects between workers).
 * Tomorrow: A WebSocketMailbox (bridging the browser and the Node Gateway).
 * Next Month: A RedisMailbox or TailscaleMailbox (connecting servers across
your private mesh).
2. The Global Router (The Registry)
The Router is the phonebook. It listens to all connected Mailboxes.
When it receives a register_object message, it updates its routing table:
{"OBJ#123": "Engine#Helsinki_Node_1"}.
When it receives a message addressed to OBJ#123, it looks up the Engine ID and
forwards the message to that specific Engine's inbound mailbox.
3. The Engine (The Local Supervisor)
The Engine manages the actual Worker threads and the SharedArrayBuffer memory
pools.
It listens to its Inbound Mailbox. When a message arrives for OBJ#123, the
Engine:
 * Checks if OBJ#123 is currently sleeping (yielded). If yes, it wakes it up
(vm.resume()).
 * Checks if OBJ#123 is dead/idle. If yes, it boots a new VM from storage,
runs the requested bytecode, and pushes the result back to the Outbound
Mailbox.
How the Syscalls Work
We can add a new FFI system call to the VM environment: ["syscall",
"register_object", "OBJ#789"].
When the VM executes this and yields, the Engine catches it and pushes this
envelope to the Outbound Mailbox:
{
  "type": "sys_register",
  "source_engine": "Engine#Pi_Node_A",
  "object_id": "OBJ#789"
}

The Global Router catches it, updates the routing table, and replies. Now the
mesh knows where to send requests for OBJ#789.
When OBJ#789 wants to call OBJ#456, it emits:
{
  "type": "call_other",
  "source_obj": "OBJ#789",
  "target_obj": "OBJ#456",
  "method": "take_damage",
  "args": [50]
}

The Engine drops this in the Outbound Mailbox. The Router sees it, notices
OBJ#456 lives on Engine#Cloudflare_Edge, and forwards it over the wire. The
target Engine runs it, and the response flows back through the exact same
decoupled pipes.
Why this is brilliant for your ecosystem
Based on your work with Cloudflare tunnels, Tailscale meshes, and WebAssembly
CRDT syncing, this mailbox abstraction is the missing link.
You can run an Engine in your hauki-office LXC container, another inside a
browser on your Huawei phone, and a Global Router on your Fastify API Gateway.
As long as they all implement the Mailbox interface (via WebSockets or REST),
objects can transparently call functions on each other across the internet as
if they were in the same local memory space.
If a node goes down, the Router can queue the messages or instantly failover
by spawning the Object on a different Engine.