chore: add changeset for atma font bundle build fix

Author: gkurt

.tegami/atma-build-entry.md

@@ -0,0 +1,8 @@
+---
+packages:
+  tegaki: patch
+---
+
+## Ship the `tegaki/fonts/atma` build output
+
+The Atma (Bengali) bundle was wired into the package `exports` map but never added to the renderer's `tsdown` build config, so `dist/fonts/atma/bundle.mjs` was missing from the published package and `import 'tegaki/fonts/atma'` failed to resolve. Registered the bundle in both the build `entry` map and the `.ttf` copy step so the compiled output ships alongside the other font bundles.