feat: conversations on a ticket are settled, and you see who is typing

A top-level comment and its replies can be resolved by whoever can
change the ticket (CommentThreadResolvedEvent), with an optional
conclusion added as a reply marked as a decision, so it shows above the
ticket. A settled conversation folds to one line (topic, who settled it
and the conclusion) and can be unfolded or reopened; the header counts
the open ones, and finishing the ticket with one open asks first.

«Ana está escribiendo…» shows in the conversation being answered, at
once: a `typing` mutation publishes to a Redis channel per ticket
(`typing` subscription), never stored. In replies, Enter sends and
Shift+Enter breaks the line, except inside lists and code.

API: resolveThread / PUT-DELETE /api/comments/{id}/resolution, Comment
.resolved/resolvedBy/resolvedAt, typing mutation and subscription. MCP:
resolve_thread.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/mcp/src/app/tools/issues.resolver.ts

@@ -290,6 +290,7 @@ export class IssuesResolver {
               by: r.users.map((u) => u.name),
             })),
             decision: c.decision || undefined,
+            resolved: c.resolved || undefined,
           }))
         : undefined;
       const decisions = (
@@ -772,6 +773,37 @@ export class IssuesResolver {
     );
   }
 
+  @Tool({
+    name: 'resolve_thread',
+    description:
+      'Settle a conversation (a top-level comment and its replies), optionally with a conclusion that is added as a reply marked as a decision; or reopen it (resolved: false). Whoever can change the ticket. Comment ids come with get_issue.',
+    paramsSchema: z.object({
+      commentId: z.string().min(1),
+      resolved: z.boolean().default(true),
+      conclusion: z.string().max(20000).optional(),
+    }),
+    annotations: { ...WRITE, idempotentHint: true },
+  })
+  resolveThread(
+    params: { commentId: string; resolved: boolean; conclusion?: string },
+    ctx: McpContext,
+  ) {
+    const client = this.api.as(ctx);
+    const path = { commentId: params.commentId };
+    return toolResult(() =>
+      this.api.data(
+        params.resolved
+          ? client.PUT('/api/comments/{commentId}/resolution', {
+              params: { path },
+              body: { conclusion: params.conclusion },
+            })
+          : client.DELETE('/api/comments/{commentId}/resolution', {
+              params: { path },
+            }),
+      ),
+    );
+  }
+
   @Tool({
     name: 'search_decisions',
     description: