docs: rebalance prose cleanup and add trimming skill

packages/ui/stdio-agent/tests/stdio-chat.spec.ts

@@ -181,7 +181,8 @@ describe('createStdioChat rendering', () => {
   it('seeds labels for agents already registered before the UI installs', async () => {
     // The pre-created `main` agent (and any agent surviving an HMR reload of just this fiber)
     // fired its `agent/created` before the UI's listener existed, so the live listener alone
-    // would miss it.
+    // would miss it. Seeding from `ctx.agents.list()` preserves the `[main turn N]` label instead
+    // of falling back to the raw session id.
     const ctx = new Context()
     await ctx.plugin(AgentRegistry)
     await ctx.plugin(UserInteractionService)