chore(gdu): add changeset for Overdrive barrel-split plugin (#409)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: amir-zahedi

.changeset/overdrive-barrel-split.md

@@ -0,0 +1,14 @@
+---
+"gdu": minor
+---
+
+feat(gdu): add Overdrive barrel-splitting Vite plugin
+
+Adds a Vite transform plugin that rewrites barrel imports from
+`@autoguru/overdrive` into deep component imports using a static 136-entry
+export manifest. This enables granular tree-shaking and prevents Vanilla
+Extract CSS side-effect leakage from unused components.
+
+Also fixes dev mode env token replacement for Vite 8/OXC — custom
+`process.env.X` dotted member expressions are now correctly inlined via a
+`devEnvReplace` pre-transform plugin, resolving broken routing in dev mode.