step 1: lock public api and pure core

src/dpg_map/exceptions.py

@@ -1 +1,29 @@
-"""Public exception types."""
+"""Public exception types for dpg-map."""
+
+
+class DpgMapError(Exception):
+    """Base exception for all public dpg-map errors."""
+
+
+class DpgMapNotImplementedError(DpgMapError, NotImplementedError):
+    """Raised by public APIs that are intentionally stubbed during the rebuild."""
+
+
+class ProviderError(DpgMapError):
+    """Base exception for tile provider errors."""
+
+
+class ProviderExistsError(ProviderError):
+    """Raised when registering a provider name that already exists."""
+
+
+class ProviderNotFoundError(ProviderError):
+    """Raised when a requested tile provider is not registered."""
+
+
+class InvalidProviderError(ProviderError, ValueError):
+    """Raised when a tile provider definition is invalid."""
+
+
+class ProjectionError(DpgMapError, ValueError):
+    """Raised when geographic projection input is invalid."""