feat(truapi-codegen): emit Rust dispatcher, wire table, and host callbacks

Extends the rustdoc-JSON code generator to emit the Rust dispatcher and wire
table consumed by truapi-server, plus the TS host-callbacks adapter. Golden
tests pin the emitted shapes.

Author: pgherveou

Cargo.lock

@@ -132,6 +132,8 @@ export function TaggedUnion<O extends TaggedUnionCodecs>(
  * channel. Encoding always emits `Domain`; decoding returns the inner domain
  * value and throws for framework-level failures that have no public `D` shape.
  */
+export type CallErrorValue<D> = D;
+
 export function CallError<D>(domain: Codec<D>): Codec<D> {
   type WireCallError =
     | { tag: "Domain"; value: D }

js/packages/truapi/src/scale.ts

@@ -0,0 +1,2 @@
+# Mismatch dumps written by tests/golden_rust_emit.rs for local inspection.
+tests/golden/*.actual