issue 976: the forge's announcements get a deterministic message id; the announcement files go, the poll's watermark is kept in the module's state

modules/gitea/merge.ts

@@ -5,7 +5,7 @@
 // puts its statuses back to pending through that writer, so where the check runs is said and no second check is asked.
 // Each bundle the runtime serves is its own process; from the tools' bundle the pending bypassed the writer's chain.
 
-import { emit } from "@novox/mesh-sdk/events";
+import { announce } from "./announce.js";
 import type { ToolDefinition } from "@novox/mesh-sdk/tools";
 import type { CommitStatus, GiteaClient } from "./client.js";
 import { mergeableUnder, newestByContext } from "./checks.js";
@@ -27,7 +27,7 @@ export interface MergeDeps {
 }
 
 export function mergeTool(gitea: GiteaClient, given: MergeDeps): ToolDefinition {
-  const deps = { ...given, emit: given.emit ?? emit, stateDir: given.stateDir ?? process.env.MESH_GITEA_STATE_DIR,
+  const deps = { ...given, emit: given.emit ?? announce, stateDir: given.stateDir ?? process.env.MESH_GITEA_STATE_DIR,
     now: given.now ?? (() => new Date()) };
   return {
     name: "gitea_merge_pull_request",