✨ feat: charts

Signed-off-by: nstarman <nstarman@users.noreply.github.com>

Author: nstarman

docs/index.md

@@ -147,7 +147,7 @@ import coordinax.interop
 
 >>> from inspect import ismodule
 >>> [name for name in dir(coordinax) if ismodule(getattr(coordinax, name))]
-['angles', 'api', 'astro', 'core', 'distances', 'hypothesis', 'interop']
+['angles', 'api', 'astro', 'charts', 'core', 'distances', 'hypothesis', 'internal', 'interop']
 ```
 
 We recommend importing as needed:

packages/coordinax.api/src/coordinax/api/_custom_types.py

@@ -1 +1,9 @@
-__all__ = ()
+__all__ = ("CKey", "CDict")
+
+from typing import Any, TypeAlias
+
+# Component key type: string for all charts (including dot-delimited product keys)
+CKey: TypeAlias = str
+
+# Parameter dictionary type alias
+CDict: TypeAlias = dict[CKey, Any]