docs(agent): note Enterprise Grid workspace install for Slack app

[skeptrunedev]

What

Adds a warning to the "Connect your Slack workspace" section of agent/slack.mdx: on Slack Enterprise Grid, installing the app to the org is not enough — you must also install it to the specific workspace, or the agent appears available at the org level but never responds in the workspace.

Includes the workspace-level install path (https://app.slack.com/manage/<your-org-id>/integrations/installed), with the org ID generalized so it applies to any reader.

Why

Real gotcha hit on Enterprise Grid — silent failure with no error, so it's worth flagging visually with a <Warning>.

English-only per repo convention (translations auto-generated on merge).

---

Note

Low Risk
Documentation-only change with no runtime, auth, or data-handling impact.

Overview
Adds a <Warning> under Connect your Slack workspace in agent/slack.mdx for Slack Enterprise Grid: org-level install alone is insufficient—the app must also be installed on each workspace where the agent should reply, or it looks connected but never responds.

The warning points readers to the org integrations page (https://app.slack.com/manage/<your-org-id>/integrations/installed) to install mintlify on the target workspace.

^{Reviewed by Cursor Bugbot for commit f5acd75. Bugbot is set up for automated code reviews on this repo. Configure here.}

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