Restructured src to more logical heirachy

core/CLAUDE.md

@@ -0,0 +1,25 @@
+# core/ — Foundation Layer
+
+Configuration, state models, and logging setup.
+
+## Modules
+
+**config.py** — `PathConfig` dataclass encapsulating all file paths (data dir, images, CSVs, fonts).
+- `validate()` method checks existence of required directories and files
+- `default_paths` module instance resolves from `Path.cwd()` (not package location)
+- Critical: CWD must be project root for relative paths to work
+
+**models.py** — `AnalysisFilters` dataclass for UI filter state (dates, drugs, trusts, directories).
+
+**logging_config.py** — Structured logging with file + console output.
+- `setup_logging()` initializes handlers
+- `get_logger(name)` returns configured logger
+
+**__init__.py** — Re-exports `PathConfig`, `default_paths`, `AnalysisFilters` for easy importing.
+
+## Usage
+
+```python
+from core import PathConfig, default_paths, AnalysisFilters
+default_paths.validate()  # Verify config on startup
+```