Release notes

RELEASE_NOTES.md

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+# Release Notes
+
+## 0.4.0-rc.1
+
+This release candidate represents a major refactor of our client networking layer in LVN Core.
+It also changes how we encode stylesheets, from Elixir literals to JSON.
+
+The other major change is that all LVN related function components now *must* have arity of 2.
+For example, if you previously had function components in a render component such as:
+
+```elixir
+def clock(assigns) do
+  ~LVN"""
+  <Clock time={@time} />
+  """
+end
+```
+
+it must now be changed to:
+
+```elixir
+def clock(assigns, _interface) do
+  ~LVN"""
+  <Clock time={@time} />
+  """
+end
+```
+
+This aligns with the `render/2` in LVN render components but also it allows for granular conditionals within function components.
+
+You will need to update the `CoreComponents` file for your client so that all function components respond to arity of 2. Compilation will
+fail if there are any function components intended for LVN templates still using arity 1.
+
+### Known issues
+
+The SwiftUI client *will* fail to compile in Xcode 16.3 beta. The `SDKROOT` environment variable, which has been in Xcode for over 25 years,
+was removed in that beta relase with no explanation as to why or what should be used instead. We are working to resolve this for the upcoming
+release of Xcode.