feat(types): add agent_session_stopped and agent_session_title_changed events

[zimeg]

Types the two agent session events an agent app receives, so app.event(...) handlers for them are type-safe in bolt-js (they flow through the SlackEvent union). Mirrors the existing assistant events.

Events

• agent_session_stopped — the user clicked the native stop button; the app should cease work and transition the session out of processing.
  • type, channel, user, thread_ts, streaming_message_ts (string array), event_ts
• agent_session_title_changed — the user renamed the session.
  • type, channel, user, team_id, thread_ts, title, previous_title, event_ts

Notes

• Field sets were confirmed against live events (via a Bolt socket-mode app), not just the docs.
• The two events are intentionally not symmetric: agent_session_title_changed carries team_id on the inner event; agent_session_stopped does not (it carries streaming_message_ts, the timestamps of any in-flight streaming messages at stop time).
• Envelope-level fields (enterprise_id, team_id on the wrapper, authorizations) are handled by the existing event-wrapper types and are not part of these inner-event interfaces.
• Opening as a draft reference — companion to the agents.sessions.* methods work (node-slack-sdk#2703); a Java SDK equivalent will mirror these shapes.

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🦋 Changeset detected

Latest commit: cba0f8f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@slack/types	Minor

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.15%. Comparing base (4322e14) to head (cba0f8f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

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##             main    #2707   +/-   ##
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  Coverage   89.15%   89.15%           
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  Files          65       65           
  Lines       10383    10383           
  Branches      473      473           
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  Hits         9257     9257           
  Misses       1095     1095           
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Flag	Coverage Δ
cli-hooks	89.15% <ø> (ø)
cli-test	89.15% <ø> (ø)
logger	89.15% <ø> (ø)
oauth	89.15% <ø> (ø)
socket-mode	89.15% <ø> (ø)
web-api	89.15% <ø> (ø)
webhook	89.15% <ø> (ø)

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