Initial plugin scaffold: lesson scheduling WordPress plugin

- Custom DB tables for availability slots and lesson bookings
- Instructor (wp-admin) and student (front-end) roles with custom capabilities
- REST API under us-scheduler/v1 for availability CRUD and booking
- [us_booking] and [us_student_login] shortcodes for student front end
- PHPUnit + Brain\Monkey unit test suite (29 tests)
- Gitea Actions CI: lint, PHPStan, tests on PHP 8.1/8.2/8.3, no-debug check
- Feature docs under docs/features/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Api/RestRegistrar.php

@@ -0,0 +1,32 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Api;
+
+use Unsupervised\Schedular\Data\AvailabilityRepository;
+use Unsupervised\Schedular\Data\BookingRepository;
+
+class RestRegistrar
+{
+    public const NAMESPACE = 'us-scheduler/v1';
+
+    private AvailabilityEndpoint $availabilityEndpoint;
+    private BookingEndpoint $bookingEndpoint;
+
+    public function __construct(AvailabilityRepository $availability, BookingRepository $bookings)
+    {
+        $this->availabilityEndpoint = new AvailabilityEndpoint($availability);
+        $this->bookingEndpoint      = new BookingEndpoint($availability, $bookings);
+    }
+
+    public function register(): void
+    {
+        add_action('rest_api_init', [$this, 'registerRoutes']);
+    }
+
+    public function registerRoutes(): void
+    {
+        $this->availabilityEndpoint->registerRoutes(self::NAMESPACE);
+        $this->bookingEndpoint->registerRoutes(self::NAMESPACE);
+    }
+}