chore(scripts): add list and delete commands to manage-webhooks

`deno task webhooks list` prints the authenticated DID's subscriptions
(id, url, method, verb). `deno task webhooks delete --id <id>` removes
a single one — pair with `list` to pick which to drop instead of
nuking everything via delete-all.

scripts/manage-webhooks.ts

@@ -18,6 +18,10 @@ Usage:
       [--method POST] \\
       [--token <outbound-bearer>]
 
+  deno task webhooks list
+
+  deno task webhooks delete --id <id>
+
   deno task webhooks delete-all
 
 Inputs (env or flag, env preferred):
@@ -150,6 +154,32 @@ const main = async () => {
     return;
   }
 
+  if (command === "list") {
+    const res = await fetch(`${api}/${session.did}/webhooks`, {
+      headers: { "Authorization": `Bearer ${session.accessJwt}` },
+    });
+    if (!res.ok) {
+      console.error(`list failed (${res.status}): ${await res.text()}`);
+      Deno.exit(1);
+    }
+    console.log(JSON.stringify(await res.json(), null, 2));
+    return;
+  }
+
+  if (command === "delete") {
+    const id = flags.id ?? die("--id is required for delete");
+    const res = await fetch(`${api}/${session.did}/webhooks/${id}`, {
+      method: "DELETE",
+      headers: { "Authorization": `Bearer ${session.accessJwt}` },
+    });
+    if (!res.ok) {
+      console.error(`delete failed (${res.status}): ${await res.text()}`);
+      Deno.exit(1);
+    }
+    console.log(`[done] webhook ${id} deleted`);
+    return;
+  }
+
   if (command === "delete-all") {
     const res = await fetch(`${api}/${session.did}/webhooks`, {
       method: "DELETE",