Prepare project for pipeline takeover: task tracker, UX doc, CLAUDE.md pointers

Adds docs/tasks/ (16 epics + 102 stories converted to task/subtask files with
statuses.md as the new status source of truth) and docs/ux-design.md
(retrospective design-system reference), and points CLAUDE.md at them.
docs/prd.md and docs/architecture.md are kept as BMAD wrote them; the legacy
docs/stories/, docs/epics/, docs/qa/gates/ and .bmad-core/ stay in place as
historical/traceability records, superseded but not deleted.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/tasks/8-4.md

@@ -0,0 +1,25 @@
+---
+id: 8-4
+title: 8-4 Booking Approved Email
+status: QA Review
+date: 2026-09-27
+parent: 8
+---
+
+## Description
+
+As a client, I want to receive notification when my booking is approved, So that I can confirm the appointment and add it to my calendar. Full implementation history: docs/stories/story-8.4-booking-approved-email.md
+
+## Acceptance Criteria
+
+- [ ] Sent on booking approval by admin
+- [ ] "Your consultation has been approved"
+- [ ] Confirmed date and time
+- [ ] Duration (45 minutes)
+- [ ] Consultation type (free/paid)
+- [ ] If paid: amount and payment instructions
+- [ ] .ics calendar file attached
+- [ ] "Add to Calendar" button
+- [ ] Location/contact information
+- [ ] Email in client's preferred language
+- [ ] Valid .ics calendar file