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-extension/src/conv.rs

@@ -4,11 +4,11 @@ use std::pin::Pin;
 use dyn_clone::DynClone;
 use never::Never;
 use orchid_base::error::{OrcErrv, OrcRes, mk_errv};
+use orchid_base::interner::is;
 use orchid_base::location::Pos;
 use trait_set::trait_set;
 
 use crate::atom::{AtomicFeatures, ForeignAtom, TAtom, ToAtom};
-use crate::context::i;
 use crate::expr::Expr;
 use crate::gen_expr::{GExpr, atom, bot};
 
@@ -27,7 +27,7 @@ impl<T: TryFromExpr, U: TryFromExpr> TryFromExpr for (T, U) {
 }
 
 async fn err_not_atom(pos: Pos) -> OrcErrv {
-	mk_errv(i().i("Expected an atom").await, "This expression is not an atom", [pos])
+	mk_errv(is("Expected an atom").await, "This expression is not an atom", [pos])
 }
 
 impl TryFromExpr for ForeignAtom {