Initialize League GUI prototype

docs/release-notes.md

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+# League of Legends GUI Overhaul PENDING
+
+## Downloads
+
+No release artifacts exist yet.
+
+## Highlights
+
+- Codex Agent Repository Kit baseline applied.
+
+## Security
+
+- Dependency audit: pending until dependencies exist.
+- Secret handling: secrets must not be committed.
+- External network calls: pending until implementation exists.
+
+## Verification
+
+| Check | Result |
+| --- | --- |
+| `git diff --check` | PENDING |
+
+## Notes
+
+Release notes are a placeholder until the project has a releasable artifact.