Add Microsoft Teams webhook integration via Power Automate workflows.
Features:
- Output-only channel for sending notifications to Teams
- Multiple webhook targets with named configuration
- Required "default" target with automatic fallback
- Rich Adaptive Card formatting with full-width rendering
- Markdown table conversion to native Adaptive Card Tables
- Column widths based on header content length
- HTTPS-only webhook URL validation
- Proper error classification for retry behavior
Configuration:
- channels.teams_webhook.enabled: bool
- channels.teams_webhook.webhooks: map of named targets
- Each target has webhook_url (SecureString) and optional title
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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