fix(register): stub env.AI so semantle init doesn't break registration

`npm run register` imports buildRegistry to derive the public command list
but ran outside the Worker runtime, so `env.AI` was undefined — semantle
(and previously doantu) tripped `createClient` type-checks. Add a no-op
AI stub alongside stubKv and wire it through the buildRegistry env.

scripts/register.js

@@ -19,7 +19,7 @@
  */
 
 import { buildRegistry, resetRegistry } from "../src/modules/registry.js";
-import { stubKv } from "./stub-kv.js";
+import { stubAi, stubKv } from "./stub-kv.js";
 
 const TELEGRAM_API = "https://api.telegram.org";
 
@@ -72,7 +72,7 @@ async function main() {
   // Build the registry against the same code the Worker uses. Stub KV
   // satisfies the binding so createStore() does not throw.
   resetRegistry();
-  const reg = await buildRegistry({ MODULES: modules, KV: stubKv });
+  const reg = await buildRegistry({ MODULES: modules, KV: stubKv, AI: stubAi });
 
   const commands = [...reg.publicCommands.values()].map(({ cmd }) => ({
     command: cmd.name,

scripts/stub-kv.js

@@ -1,11 +1,12 @@
 /**
- * @file stub-kv — minimal no-op KVNamespace stub used by scripts/register.js.
+ * @file stub-kv — no-op binding stubs used by scripts/register.js.
  *
  * The register script imports buildRegistry() to derive the public command
- * list at deploy time. buildRegistry calls createStore() → CFKVStore → needs
- * a KV binding. This stub satisfies the shape without doing any real IO,
- * since module init hooks in this codebase read-only (or tolerate missing
- * state). If a future module writes inside init(), update the stub to
+ * list at deploy time. Module init hooks in this codebase dereference
+ * runtime bindings like `env.KV` (via createStore) and `env.AI` (semantle).
+ * These stubs satisfy the shape without doing any real IO. All init hooks
+ * are assumed read-only (or tolerant of missing state) at registration time.
+ * If a future module writes inside init(), update the matching stub to
  * swallow writes or gate the write on a `process.env.REGISTER_DRYRUN` flag.
  */
 
@@ -33,3 +34,13 @@ export const stubKv = {
     return { value: null, metadata: null };
   },
 };
+
+/**
+ * Workers AI binding stub. Semantle's init() wires `createClient(env.AI)`
+ * which only type-checks `.run` — no inference ever fires during register.
+ */
+export const stubAi = {
+  async run() {
+    return { data: [] };
+  },
+};