docs(slack): add missing DM scopes to manifest (openclaw#29999) thanks @JcMinarro

Verified:
- pnpm install --frozen-lockfile
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: JcMinarro <4047514+JcMinarro@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

CHANGELOG.md

@@ -83,6 +83,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Docs/Slack manifest scopes: add missing DM/group-DM bot scopes (`im:read`, `im:write`, `mpim:read`, `mpim:write`) to the Slack app manifest example so DM setup guidance is complete. (#29999) Thanks @JcMinarro.
 - Slack/Bot attachment-only messages: when `allowBots: true`, bot messages with empty `text` now include non-forwarded attachment `text`/`fallback` content so webhook alerts are not silently dropped. (#27616)
 - Slack/Inbound media auth + HTML guard: keep Slack auth headers on forwarded shared attachment image downloads, and reject login/error HTML payloads (while allowing expected `.html` uploads) when resolving Slack media so auth failures do not silently pass as files. (#18642)
 - Slack/Security ingress mismatch guard: drop slash-command and interaction payloads when app/team identifiers do not match the active Slack account context (including nested `team.id` interaction payloads), preventing cross-app or cross-workspace payload injection into system-event handling. (#29091) Thanks @Solvely-Colin.

docs/channels/slack.md

@@ -359,7 +359,11 @@ Notes:
         "channels:read",
         "groups:history",
         "im:history",
+        "im:read",
+        "im:write",
         "mpim:history",
+        "mpim:read",
+        "mpim:write",
         "users:read",
         "app_mentions:read",
         "assistant:write",