Restructured src to more logical heirachy

config/CLAUDE.md

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+# Config Package
+
+Snowflake configuration management with dataclass hierarchy and TOML loading.
+
+## Modules
+
+**__init__.py** - Configuration dataclass hierarchy:
+- `ConnectionConfig`, `TimeoutConfig`, `CacheConfig`, `QueryConfig` — Settings containers
+- `TableReference` — Snowflake object reference with `fully_qualified_name` property
+- `TablesConfig` — Common table references (activity, patient, medication, organization)
+- `SnowflakeConfig` — Root config aggregating all above + `validate()` and `is_configured` property
+- `load_snowflake_config(path=None)` — Load from TOML, default `config/snowflake.toml`
+- `get_snowflake_config()` — Cached singleton access
+- `reload_snowflake_config()` — Force reload from disk
+
+**snowflake.toml** — Snowflake connection settings (co-located with loader)
+
+## Key Details
+
+- Uses `tomllib` (Python 3.11+) with `tomli` fallback for 3.10
+- Missing config file returns default SnowflakeConfig (no error)
+- All dataclasses have sensible defaults (DATA_HUB.DWH, 24h cache TTL, etc.)
+- Config is stateless but cached; call `reload_snowflake_config()` to refresh