docs: add .claude-context project overview

.claude-context/00-overview.md

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+# LEGO Dimensions Portal Reader
+
+Python module for communicating with LEGO Dimensions USB portals (PS3/PS4/Wii U versions) to detect character and vehicle disc placement/removal events.
+
+**Repository:** https://gitea.hideawaygaming.com.au/jessikitty/lego-dimensions-reader
+
+## Purpose
+Drives the Moonlight Drive-In video player system — placing a LEGO Dimensions character disc triggers themed video playback and LED light effects.
+
+## Architecture
+- **Core module:** `lego_dimensions_reader.py` — event-driven NFC tag detection with callbacks
+- **Character database:** `character_database.json` — maps IDs to character/vehicle names
+- **Integration:** `moonlight_integration.py` — connects portal events to video player
+
+## Key Features
+- Tag insert/remove callbacks
+- LED control: solid color, flash, fade, rainbow cycle
+- TEA encryption/decryption for character ID extraction
+- Built-in character (82) and vehicle (82) databases
+- Cross-platform: Linux native, Windows via WinUSB/Zadig
+
+## Session Log
+- 2026-09-23 — Windows Driver Fix — Resolved pyusb backend issues on Windows 11; requires `pip install libusb` and Zadig WinUSB driver
+
+---
+*Created by: Jess Rogerson (yelling commands at Claude.AI)*