feat(03-02): create resource module structure

- Created src/resource/__init__.py with module docstring
- Exported HardwareTierDetector (to be implemented)
- Established resource management module foundation

src/resource/__init__.py

@@ -0,0 +1,17 @@
+"""Resource management system for Mai.
+
+This module provides intelligent resource detection, tier classification, and
+adaptive scaling to enable Mai to run gracefully across different hardware
+configurations from low-end systems to high-end workstations.
+
+Key components:
+- HardwareTierDetector: Classifies system capabilities into performance tiers
+- ProactiveScaler: Monitors resources and requests scaling when needed
+- ResourcePersonality: Communicates resource status in Mai's personality voice
+"""
+
+from .tiers import HardwareTierDetector
+
+__all__ = [
+    "HardwareTierDetector",
+]