feat: Slack/Teams bot for automated standup posting

[Hrithik-Gavankar]

Summary

Build a bot integration that automatically posts standup notes to Slack or Microsoft Teams channels on a configurable schedule.

Motivation

• Engineers forget to post standups — automation solves this
• Consistent format across the team
• Historical standup archive in the channel

Proposed Features

• Slack webhook integration (post to a channel)
• Microsoft Teams webhook integration
• Configurable schedule (e.g., 9:30 AM on weekdays)
• Draft mode (sends to DM for review before posting)
• Weekend/holiday awareness (skip non-work days)
• Customizable message template per team
• Optional: interactive buttons ("Edit before posting", "Skip today")

Technical Options

1. Webhook-based (simplest): cron job runs scan.sh + formats + POSTs to webhook
2. Slack App: richer UX with slash commands, but more setup
3. GitHub Action: runs on schedule, posts via webhook

Configuration Example

# .engineer-brain/notifications.yaml
standup:
  enabled: true
  channel: "#team-devtools-standup"
  schedule: "0 9 * * 1-5"  # 9 AM weekdays
  platform: slack
  webhook_url_env: SLACK_STANDUP_WEBHOOK
  draft_mode: true