task_local context over context objects

- interner impls logically separate from API in orchid-base (default host interner still in base for testing)
- error reporting, logging, and a variety of other features passed down via context in extension, not yet in host to maintain library-ish profile, should consider options
- no global spawn mechanic, the host has a spawn function but extensions only get a stash for enqueuing async work in sync callbacks which is then explicitly, manually, and with strict order popped and awaited
- still deadlocks nondeterministically for some ungodly reason

orchid-std/src/macros/instantiate_tpl.rs

@@ -4,7 +4,6 @@ use never::Never;
 use orchid_base::format::fmt;
 use orchid_extension::atom::{Atomic, TAtom};
 use orchid_extension::atom_owned::{OwnedAtom, OwnedVariant, own};
-use orchid_extension::context::i;
 use orchid_extension::conv::ToExpr;
 use orchid_extension::coroutine_exec::exec;
 use orchid_extension::expr::Expr;
@@ -38,7 +37,7 @@ impl OwnedAtom for InstantiateTplCall {
 	async fn call(mut self, arg: Expr) -> GExpr {
 		exec(async move |mut h| {
 			match h.exec::<TAtom<MacTree>>(arg.clone()).await {
-				Err(_) => panic!("Expected a macro param, found {}", fmt(&arg, &i()).await),
+				Err(_) => panic!("Expected a macro param, found {}", fmt(&arg).await),
 				Ok(t) => self.argv.push(own(&t).await),
 			};
 			if self.argv.len() < self.argc {