feat(slack): add Agent Sessions lifecycle and native stop

[bensabic]

Migrates Slack's agent_view integration to the Agent Sessions lifecycle while preserving the legacy assistant_view compatibility path.

• Adds agents.sessions.setStatus and agents.sessions.rename support for processing, active, suspended, and closed sessions.
• Handles agent_session_stopped without taking the message lock, clears Slack's processing state, and dispatches onAgentSessionStopped.
• Adds cross-process turn cancellation through the configured state adapter and exposes the active turn as thread.signal.
• Handles agent_session_title_changed and automatically titles new agent conversations from their root message, with a configurable resolver.
• Propagates session_status through native stream completion and supports suspended human-in-the-loop turns.
• Updates Slack manifests, examples, API docs, fixtures, and migration guidance for the February 2027 assistant_view retirement.

Configure the Agent messaging experience and optional title resolver:

const slack = createSlackAdapter({
  agentView: true,
  sessionTitle: ({ text }) => text.split("\n", 1)[0]?.slice(0, 80) ?? null,
});

Pass the thread signal into model generation so Slack's native stop button cancels upstream work as well as message delivery:

bot.onDirectMessage(async (thread, message) => {
  await thread.startTyping();

  const result = await agent.stream({
    prompt: message.text,
    abortSignal: thread.signal,
  });

  await thread.post(result.fullStream);
});

React to session lifecycle events:

bot.onAgentSessionStopped(async (event) => {
  await releaseExternalResources(event.threadId);
});

bot.onAgentSessionTitleChanged(async (event) => {
  await syncTitle(event.threadId, event.title);
});

Leave a stream suspended when the agent needs user input or approval:

await thread.post(
  new StreamingPlan(result.fullStream, {
    sessionStatus: "suspended",
  })
);

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