Add project scope documentation for AI playgroup registration system

Define complete non-technical scope for replacing Google Forms registration
with an AI-powered conversational agent. Includes:

- Registration data requirements (13 fields with validation rules)
- Knowledge base content (fees, regulations, schedule, FAQ from official PDFs)
- Conversation flow design with bilingual support (German/English)
- Agent personality guidelines (warm & friendly tone)
- Admin notification routing by playgroup type
- Email reminder system for incomplete registrations
- Data export formats (CSV/JSON)
- Channel configuration (email + chat)
- Release priorities (MVP scope defined)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/changes/define-project-scope/specs/registration-notifications/spec.md

@@ -0,0 +1,41 @@
+## ADDED Requirements
+
+### Requirement: Notify admin on completed registration
+The system SHALL send an email notification to the admin when a new registration is completed.
+
+#### Scenario: Notification sent
+- **WHEN** a parent completes a registration
+- **THEN** the admin SHALL receive an email notification
+
+#### Scenario: Notification timing
+- **WHEN** a registration is completed
+- **THEN** the notification SHALL be sent promptly (within minutes)
+
+### Requirement: Notification contains registration summary
+The system SHALL include a summary of the registration in the notification email.
+
+#### Scenario: Summary content
+- **WHEN** a notification email is sent
+- **THEN** it SHALL include child name, parent contact, requested booking days, and any special needs noted
+
+#### Scenario: Notification links to full record
+- **WHEN** the admin views the notification email
+- **THEN** it SHALL indicate how to access the full registration record
+
+### Requirement: Notification identifies source channel
+The system SHALL indicate in the notification which channel the registration came through.
+
+#### Scenario: Email registration notification
+- **WHEN** a registration completed via email triggers a notification
+- **THEN** the notification SHALL indicate the registration came via email
+
+#### Scenario: Chat registration notification
+- **WHEN** a registration completed via chat triggers a notification
+- **THEN** the notification SHALL indicate the registration came via chat
+
+### Requirement: Admin can configure notification preferences
+The system SHALL allow the admin to configure notification email address.
+
+#### Scenario: Update notification email
+- **WHEN** the admin changes the notification email address
+- **THEN** subsequent notifications SHALL be sent to the new address