Land feature 57's SDK work on its release branch

Providers, the state bus, templates and the environment collection that the
feature's modules build on (feature 57, config and provisioning).

test/standing.test.ts

@@ -9,9 +9,9 @@ import { tmpdir } from "node:os";
 import { join } from "node:path";
 
 import {
-  runProvisioner, classOf, FAILING_EVENT, RECOVERED_EVENT, RETIREMENT_EVENT,
+  runProviderLoop, classOf, FAILING_EVENT, RECOVERED_EVENT, RETIREMENT_EVENT,
   CLASS_CREDENTIALS, CLASS_UNREACHABLE, CLASS_SECRET, CLASS_REFUSED, type Adapter,
-} from "../dist/provisioner/index.js";
+} from "../dist/provider-loop/index.js";
 import { useBroker } from "../dist/messaging/index.js";
 
 const EVERY = 10;
@@ -68,7 +68,7 @@ async function world(opts: { classify?: boolean; announce?: false; stableForMs?:
   };
   const was = console.error;
   console.error = () => {};
-  const stop = runProvisioner("postgres-database", adapter, {
+  const stop = runProviderLoop("postgres-database", adapter, {
     receives, everyMs: EVERY, verifyEveryMs: 0, node: "home-server",
     failingAfterMs: FAILING_AFTER, sayAgainEveryMs: SAY_AGAIN, stableForMs: opts.stableForMs ?? 0,
     ...(opts.announce === false ? {} : {