feat: add uwf cas reindex command

Rebuilds _index from all .bin nodes. Use after upgrading to json-cas 0.2.0
on an existing CAS directory.

packages/cli-uwf/src/cli.ts

@@ -15,6 +15,7 @@ import {
   cmdCasGet,
   cmdCasHas,
   cmdCasPut,
+  cmdCasReindex,
   cmdCasRefs,
   cmdCasSchemaGet,
   cmdCasSchemaList,
@@ -239,6 +240,16 @@ cas
     });
   });
 
+cas
+  .command("reindex")
+  .description("Rebuild type index from all CAS nodes")
+  .action(() => {
+    const storageRoot = resolveStorageRoot();
+    runAction(async () => {
+      writeOutput(await cmdCasReindex(storageRoot));
+    });
+  });
+
 const casSchema = cas.command("schema").description("CAS schema operations");
 
 casSchema

packages/cli-uwf/src/commands/cas.ts

@@ -115,6 +115,17 @@ export async function cmdCasSchemaList(
   return entries;
 }
 
+export async function cmdCasReindex(
+  storageRoot: string,
+): Promise<{ status: string }> {
+  const indexDir = join(storageRoot, "cas", "_index");
+  const { rmSync } = await import("node:fs");
+  rmSync(indexDir, { recursive: true, force: true });
+  // Re-open store to trigger migration rebuild
+  openStore(storageRoot);
+  return { status: "reindexed" };
+}
+
 export async function cmdCasSchemaGet(
   storageRoot: string,
   hash: string,