docs: Add Slack local development setup guide

[inkeep]

Summary

This PR adds documentation for setting up local Slack development using Socket Mode, as requested by @miles in Slack.

Changes

New file

• agents-docs/content/talk-to-your-agents/slack/local-development.mdx — A comprehensive guide for developers to set up their own personal Slack app for local development

Updated file

• agents-docs/content/talk-to-your-agents/slack/meta.json — Added the new page to sidebar navigation

What's documented

• Why one app per developer — Socket Mode distributes events randomly; sharing an app splits events between developers
• Quick setup (pnpm setup-slack-dev) — Automated script handling app creation, token collection, OAuth install, and .env configuration
• Manual setup — Step-by-step alternative using the canonical app manifest
• Verification steps — How to confirm Socket Mode is running
• Architecture overview — How Socket Mode compares to production HTTP transport
• Troubleshooting — Common issues with missing tokens, HMR restarts, missing events, etc.

Source material

Based on:

• packages/agents-work-apps/src/slack/README.md
• scripts/setup-slack-dev.ts

---

cc @miles for review

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Project	Deployment	Actions	Updated (UTC)
agents-api	Ready	Preview, Comment	Feb 19, 2026 9:38pm
agents-docs	Ready	Preview, Comment	Feb 19, 2026 9:38pm
agents-manage-ui	Ready	Preview, Comment	Feb 19, 2026 9:38pm