Merge commit '36c66dd290d3ce6eb1ccd310d0c658d4a32bb8eb' as 'repos/effect'

repos/effect/.changeset/refactor-config-provider.md

@@ -0,0 +1,23 @@
+---
+"effect": patch
+---
+
+Fix config path composition and directory-backed lookup behavior.
+
+`ConfigProvider.orElse` now keeps each side's own `nested` and `mapInput`
+behavior. Applying `nested` or `mapInput` to a combined provider now applies the
+same transformation to both sides.
+
+`ConfigProvider` path transformations now compose as a single path function.
+This makes `nested` and `mapInput` behave consistently with normal function
+composition.
+
+`Config.nested` now tracks the logical config path in `Config` itself instead of
+wrapping the provider. This keeps lookup paths and schema error paths aligned.
+The low-level `Config.make` constructor is no longer exported; use config
+constructors and combinators, or implement custom lookup behavior with
+`ConfigProvider.make`.
+
+`ConfigProvider.fromDir` now returns `undefined` when neither a file nor a
+directory exists at the requested path, so `orElse` can fall back instead of
+failing with `SourceError`.