Major feat(Documentation): Complete documentation rework

Split documentation into three folders: Architecture, Testing and
Installation.

Rework and expand architecture.md alongside interfaces.md

Split all parts to do with testing from Architecture md's into Test md's

Add parameter to ExamResultGenerator node documentation

doc/architecture/nodes/ExamResultGenerator.md

@@ -0,0 +1,43 @@
+# ExamResultGenerator (`assignments::one::exam_result_generator`)
+
+## Overview
+The `ExamResultGenerator` is the core node responsible for simulating exam result generation.
+It maintains a queue of student-course combinations that need exam results, generates random
+grades, and publishes them to the system.
+
+#### Implementation Details
+
+**Parameters**
+
+- **`delay_between_grades_ms`** (int, default: 2000): Delay (in milliseconds) between generated grades.
+
+**Constructor**
+```cpp
+ExamResultGenerator()
+```
+- Initializes ROS2 node with name `exam_result_generator`
+- Sets up random number generation infrastructure
+- Creates DatabaseManager instance with node logger
+- Establishes ROS2 publishers, subscribers, and timers
+- Loads initial pending combinations from database
+
+**Core Functions**
+
+**`void queue_pending_combinations()`**
+- Gets all student-course combinations needing exam results
+- Populates operations queue from database
+- Called at initialization and when database state changes
+
+**`void generate_random_result()`**
+- Main exam result generation executed by timer
+- Selects random student-course combination from queue
+- Stores result in database and publishes to ROS2 topic
+
+**`void student_management_callback(const g2_2025_interfaces::msg::Student::SharedPtr msg)`**
+- Toggles combinations in/out of processing queue
+- Updates database with new enrollments
+
+**`void add_student_course_combination(const StudentCourse& sc)`**
+- Enrolls student into course via database
+- Adds combination to processing queue
+