docs: implement professional documentation structure and project hygiene

docs/tasks.md

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+# Task Tracker
+
+Plexus uses a custom-built task tracking system to manage its development lifecycle. The data is stored in a local DuckDB database (`data/tasks.duckdb`).
+
+## 🛠 Commands
+
+You can interact with the task tracker using the `Makefile`:
+
+| Command | Description |
+|---------|-------------|
+| `make task-list` | List all active tasks. |
+| `make task-add title="..."` | Add a new task. |
+| `make task-update id=... status="..."` | Update a task's status. |
+| `make task-done id=...` | Mark a task as completed. |
+| `make task-filter status="..."` | Filter tasks by status. |
+
+## 📊 Task Statuses
+
+- `todo`: Task is waiting to be started.
+- `in-progress`: Task is currently being worked on.
+- `done`: Task is completed.
+- `blocked`: Task is waiting on external factors.
+
+## 🐍 Implementation Details
+
+The task tracker is implemented in Python and uses the `duckdb` library. The source code can be found in the `tasks/` directory.