feat: builder-style InputSpec API, prefill plumbing, and port forward fix

- Add addKey() and add() builder methods to InputSpec with InputSpecTools
- Move OuterType to last generic param on Value, List, and all dynamic methods
- Plumb prefill through getActionInput end-to-end (core → container-runtime → SDK)
- Filter port_forwards to enabled addresses only
- Bump SDK to 0.4.0-beta.50

container-runtime/package-lock.json

@@ -38,7 +38,7 @@
     },
     "../sdk/dist": {
       "name": "@start9labs/start-sdk",
-      "version": "0.4.0-beta.49",
+      "version": "0.4.0-beta.50",
       "license": "MIT",
       "dependencies": {
         "@iarna/toml": "^3.0.0",

container-runtime/src/Adapters/RpcListener.ts

@@ -437,6 +437,7 @@ export class RpcListener {
               return system.getActionInput(
                 effects,
                 procedures[2],
+                input?.prefill ?? null,
                 timeout || null,
               )
             case procedures[1] === "actions" && procedures[3] === "run":

container-runtime/src/Adapters/Systems/SystemForEmbassy/index.ts

@@ -510,6 +510,7 @@ export class SystemForEmbassy implements System {
   async getActionInput(
     effects: Effects,
     actionId: string,
+    _prefill: Record<string, unknown> | null,
     timeoutMs: number | null,
   ): Promise<T.ActionInput | null> {
     if (actionId === "config") {

container-runtime/src/Adapters/Systems/SystemForStartOs.ts

@@ -47,11 +47,12 @@ export class SystemForStartOs implements System {
   getActionInput(
     effects: Effects,
     id: string,
+    prefill: Record<string, unknown> | null,
     timeoutMs: number | null,
   ): Promise<T.ActionInput | null> {
     const action = this.abi.actions.get(id)
     if (!action) throw new Error(`Action ${id} not found`)
-    return action.getInput({ effects })
+    return action.getInput({ effects, prefill })
   }
   runAction(
     effects: Effects,

container-runtime/src/Interfaces/System.ts

@@ -33,6 +33,7 @@ export type System = {
   getActionInput(
     effects: Effects,
     actionId: string,
+    prefill: Record<string, unknown> | null,
     timeoutMs: number | null,
   ): Promise<T.ActionInput | null>