Return the new alert channel's id

docs/api-automation.md

@@ -22,6 +22,7 @@ level, and a server key has no user, so `/api/me` and other per-user routes refu
 | `GET /api/edges` was session-only | accepts keys; an org key sees the edges its org may use |
 | No way to list orgs with a key | `GET /api/orgs` |
 | Key creation did not return the key's ID | create response now has `id` as well as `key` |
+| Creating an alert channel returned only `{ok:true}` | response now includes the channel `id` |
 | `createOrg` added the caller as a member | skipped for server keys (they have no user) |
 
 ## Known remaining gaps (not blocking scripting)