Say a pull request nobody checks as a delivery held, owned by mesh-delivery (hq issue 347)

The confirmation review asked for the delivery domain's own vocabulary
instead of a provider standing. A gitea health check would need a `tools`
list (turning gitea's tools into seat verbs), a check of another kind
beside it, and would hold the forge's own deliveries at the first-node
gate; so the delivery's owner says it, with the word it already has.

- gitea_open_pulls (gitea): every open pull request from the forge itself,
  with what its base requires and the statuses its head has.
- mesh-delivery asks it every five minutes and keeps its own first-seen
  time per head (the forge's update time moves on every comment). A head
  on a base requiring mesh/merge-gate OR mesh/repo-check (hq requires only
  the second) with neither for ten minutes is a `stalled` line in state
  `unannounced`, which the controller raises as delivery.<id>.stalled (D14);
  H2 has nothing to close. Once announced it is a delivery of its own.
- The gitea-side watcher and its provider standing are gone.

modules/gitea/pulls.ts

@@ -113,31 +113,6 @@ export function reposToLook(repos: GiteaRepo[], floor: string, pulls: PullSeen[]
   return repos.filter((r) => moved.has(r.full_name));
 }
 
-/** How long a head may go without a merge check before it is said: the announcer's passes are half a minute
- *  apart and the check is asked at once, so ten minutes is a fault, never a queue. */
-export const UNANNOUNCED_AFTER_MS = 10 * 60_000;
-
-/** An open pull request as the watcher of announcements reads it. */
-export interface OpenPull {
-  /** `owner/repo#number`. */
-  key: string;
-  base: string;
-  head_sha: string;
-  /** When its head last moved, or it was opened or retargeted. */
-  updated_at?: string;
-  /** The status contexts its head has, any state. */
-  statuses: string[];
-  /** The contexts its base branch's protection requires. */
-  required: string[];
-}
-
-/** The open pull requests whose base requires the merge check and whose head has had none for ten minutes
- *  (novox/hq issue 347): announced by nobody, checked by nothing, and blocked from merging with no word why. */
-export function unannounced(pulls: OpenPull[], now: number, after = UNANNOUNCED_AFTER_MS): OpenPull[] {
-  return pulls.filter((p) => p.required.includes(CHECK_CONTEXT) && !p.statuses.includes(CHECK_CONTEXT) &&
-    !!p.updated_at && now - Date.parse(p.updated_at) >= after);
-}
-
 // **A required status is success or it blocks** (novox/hq issue 293). The forge combines `warning` as a
 // failure, and a branch whose protection requires mesh/merge-gate or mesh/repo-check — with no
 // administrator override — will not merge past one. So the controller's `warning`, a note and never a