Add missing app_mentions:read scope to Slack app manifest

[Copilot]

The Slack app manifest was missing the app_mentions:read OAuth scope, which is required for the bot to receive app_mention events that the application subscribes to and handles in slack_listener.py.

Changes

• Added app_mentions:read to oauth_config.scopes.bot in the manifest (README.md line 49)

The manifest already declared the app_mention event subscription but lacked the corresponding OAuth scope needed to receive those events.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>App manifest is incorrect</issue_title>
<issue_description>I believe it should be

display_information:
  name: Claude Code Bot
  description: Bidirectional communication with Claude Code sessions
  background_color: "#000000"

features:
  bot_user:
    display_name: Claude Code Bot
    always_online: true

oauth_config:
  scopes:
    bot:
      - app_mentions:read
      - channels:history
      - channels:read
      - chat:write
      - reactions:read
      - reactions:write
      - users:read
      - groups:history
      - groups:read
      - im:history
      - im:read
      - mpim:history
      - mpim:read

settings:
  event_subscriptions:
    bot_events:
      - app_mention
      - message.channels
      - message.groups
      - message.im
      - message.mpim
      - reaction_added
  interactivity:
    is_enabled: false
  org_deploy_enabled: false
  socket_mode_enabled: true
  token_rotation_enabled: false

```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes App manifest is incorrect #6

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