feat: add Slack and Discord Moss Q&A demo

[hasnainkhatri87]

Pull Request Checklist

• I have read the CONTRIBUTING guide.
• I have updated the documentation.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have added tests that prove the feature works.
• New tests pass locally with my changes.

Description

Summary

Adds a community demo that answers workspace questions in Slack and Discord using a shared Moss retrieval pipeline.

Implementation

• Adds a Slack Socket Mode adapter that responds to app mentions in threads.
• Adds a Discord adapter that responds to !ask messages and direct bot mentions.
• Shares a bounded Moss context builder and OpenAI-compatible answer generator between both adapters.
• Documents setup, environment variables, and platform configuration.
• Adds credential-free unit tests for message extraction and answer-engine behavior.

Testing

• uv run pytest — 8 passed
• uv run ruff check . — passed
• uv run ruff format --check . — passed
• Python compilation — passed

Compatibility and risk

This is an additive experimental demo under moss-live-labs/community-demos. Live Slack/Discord behavior requires platform credentials and a configured Moss index; those external integrations were not exercised locally.

Fixes #384

Type of Change

• Bug fix
• New feature
• Breaking change
• This change includes a documentation update

[Copilot]

Pull request overview

Adds an experimental community demo under moss-live-labs/community-demos/slack-discord-qa that answers workspace questions in Slack (Socket Mode app_mention) and Discord (!ask / bot mentions) using a shared Moss retrieval + OpenAI-compatible answering pipeline.

Changes:

• Introduces Slack and Discord adapters that extract questions and post threaded replies.
• Adds a shared AnswerEngine with bounded context construction and pluggable retriever/responder protocols.
• Adds demo documentation, environment templates, packaging (pyproject.toml), and credential-free unit tests.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
moss-live-labs/community-demos/slack-discord-qa/moss_slack_discord/adapters.py	Slack/Discord event adapters + question extraction logic
moss-live-labs/community-demos/slack-discord-qa/moss_slack_discord/qa_engine.py	Shared retrieval/response engine and bounded context builder
moss-live-labs/community-demos/slack-discord-qa/moss_slack_discord/app.py	App wiring: env loading, Moss index load, OpenAI responder, adapter startup
moss-live-labs/community-demos/slack-discord-qa/tests/test_adapters.py	Unit tests for Slack/Discord message extraction
moss-live-labs/community-demos/slack-discord-qa/tests/test_qa_engine.py	Unit tests for context building + answer engine behavior
moss-live-labs/community-demos/slack-discord-qa/README.md	Setup/configuration documentation for Slack + Discord
moss-live-labs/community-demos/slack-discord-qa/pyproject.toml	Demo package metadata, dependencies, script entrypoint, pytest config
moss-live-labs/community-demos/slack-discord-qa/moss_slack_discord/init.py	Package marker / module docstring
moss-live-labs/community-demos/slack-discord-qa/.env.example	Example environment variables for Moss/OpenAI/Slack/Discord
moss-live-labs/community-demos/slack-discord-qa/.gitignore	Ignores local env/venv/test caches

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