feat(task): rig as ai agent interface via wasm

[LeoBorai]

wake me up when reqwest supports wasi.

[LeoBorai]

Leaving this PR as a note to self for the future when spawning Rig via Job Queue under WASI is cool.

[LeoBorai]

For the record, here is the stack trace:

Caused by:
    wasm trap: wasm `unreachable` instruction executed job_id=6850b56a-a384-484c-aec7-cb484bd33ea5
2026-02-25T23:36:23.342907Z ERROR mate::process::executor: Job execution failed err=error while executing at wasm backtrace:
    0:  0xeab78 - agent.wasm!abort
    1:  0xe0db8 - agent.wasm!std[fe515bc9a8625ade]::sys::pal::wasi::helpers::abort_internal
    2:  0xde258 - agent.wasm!std[fe515bc9a8625ade]::process::abort
    3:  0xdeaa6 - agent.wasm!__rustc[d6e935dc4dcc4704]::__rust_abort
    4:  0xdcec0 - agent.wasm!__rustc[d6e935dc4dcc4704]::__rust_start_panic
    5:  0xde8d3 - agent.wasm!__rustc[d6e935dc4dcc4704]::rust_panic
    6:  0xddacc - agent.wasm!std[fe515bc9a8625ade]::panicking::panic_with_hook
    7:  0xdd6ac - agent.wasm!std[fe515bc9a8625ade]::panicking::panic_handler::{closure#0}
    8:  0xdd63f - agent.wasm!std[fe515bc9a8625ade]::sys::backtrace::__rust_end_short_backtrace::<std[fe515bc9a8625ade]::panicking::panic_handler::{closure#0}, !>
    9:  0xdeb89 - agent.wasm!__rustc[d6e935dc4dcc4704]::rust_begin_unwind
   10:  0xf43ca - agent.wasm!core[6bd4aef71b630da9]::panicking::panic_fmt
   11:  0xacd3b - agent.wasm!js_sys[a677626dfcc0f3d2]::global::get_global_object::GLOBAL_THIS::init
   12:  0xac8b3 - agent.wasm!js_sys[a677626dfcc0f3d2]::global::get_global_object
   13:  0xac5f9 - agent.wasm!js_sys[a677626dfcc0f3d2]::global
   14:  0xaa24e - agent.wasm!<wasm_bindgen_futures[a08c128f077cc4c6]::queue::Queue>::new
   15:  0x91d3d - agent.wasm!<wasm_bindgen_futures[a08c128f077cc4c6]::task::singlethread::Task>::spawn::<<rig[8340c8829133549d]::tool::server::ToolServer>::run::{closure#0}>
   16:  0x90339 - agent.wasm!<rig[8340c8829133549d]::tool::server::ToolServer>::run
   17:  0x5fd1f - agent.wasm!<rig[8340c8829133549d]::agent::builder::AgentBuilder<rig[8340c8829133549d]::providers::openrouter::completion::CompletionModel>>::build
   18:  0x54c57 - agent.wasm!agent[4d48b5bd29e81c59]::prompt_agent::{closure#0}::{closure#0}
   19:  0x555d7 - agent.wasm!<async_task[c055fa926d1eb537]::raw::RawTask<agent[4d48b5bd29e81c59]::prompt_agent::{closure#0}::{closure#0}, core[6bd4aef71b630da9]::result::Result<agent[4d48b5bd29e81c59]::Response, anyhow[f7ae62c78d8fdf57]::Error>, <wstd[a507aff21e99a6d7]::runtime::reactor::Reactor>::spawn_unchecked<agent[4d48b5bd29e81c59]::prompt_agent::{closure#0}::{closure#0}, core[6bd4aef71b630da9]::result::Result<agent[4d48b5bd29e81c59]::Response, anyhow[f7ae62c78d8fdf57]::Error>>::{closure#0}, ()>>::run
   20:  0x6569b - agent.wasm!wstd[a507aff21e99a6d7]::runtime::block_on::block_on::<agent[4d48b5bd29e81c59]::prompt_agent::{closure#0}::{closure#0}>
   21:  0x6be15 - agent.wasm!agent[4d48b5bd29e81c59]::bindings::_export_handler_cabi::<agent[4d48b5bd29e81c59]::Mate>::{closure#0}
   22:  0x71a7e - agent.wasm!<wit_bindgen[9d19e5fa9947fbff]::rt::async_support::FutureState>::callback
   23:  0x71d1b - agent.wasm!wit_bindgen[9d19e5fa9947fbff]::rt::async_support::callback
   24:  0x6b9fc - agent.wasm!wit_bindgen[9d19e5fa9947fbff]::rt::async_support::start_task::<agent[4d48b5bd29e81c59]::bindings::_export_handler_cabi<agent[4d48b5bd29e81c59]::Mate>::{closure#0}>
   25:  0x5c776 - agent.wasm![async-lift]handler

Caused by:
    wasm trap: wasm `unreachable