Add Rustler NIF for Elixir wRPC bindings

[Copilot]

Implements Elixir NIF bindings for the wRPC transport layer, enabling Elixir applications to invoke WIT functions over TCP.

Changes

• Rust NIF (native/wrpc_nif/) - Wraps wrpc-transport TCP client using Rustler

  • Lazy-initialized Tokio runtime for async operations
  • Resource-based client handle management
  • DirtyCPU scheduler for blocking invoke calls

• Elixir API (lib/wrpc/)

  • Wrpc.Tcp.connect/1 - Create TCP client connections
  • Wrpc.invoke/4 - Invoke remote WIT functions

Usage

{:ok, client} = Wrpc.Tcp.connect("127.0.0.1:7761")
{:ok, result} = Wrpc.invoke(client, "wrpc-examples:hello/handler", "hello", <<>>)

Dependencies

• rustler ~> 0.34.0
• wrpc-transport 0.28 (Rust)
• tokio 1.x (Rust)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)
• https://api.github.com//advisories
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)
• https://api.github.com/repos/bytecodealliance/wrpc
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)
• repo.hex.pm
  • Triggering command: /usr/lib/erlang/erts-13.2.2.5/bin/inet_gethost 4 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

https://github.com/bytecodealliance/wrpc

Build a rustler NIF for Elixir to use wRPC

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