docs(shared): note cache-paths export is required by Playground Integration Tests

Expand the tsdown entry comment to explicitly warn that removing the
cache-paths export breaks the "Playground Integration Tests" CI job (the
dev-playground server fails to boot with ERR_PACKAGE_PATH_NOT_EXPORTED and
Playwright times out), and that build/typecheck/unit tests do NOT catch it.

Co-authored-by: Isaac
Signed-off-by: Atila Fassina <atila@fassina.eu>

Author: atilafassina

packages/shared/tsdown.config.ts

@@ -11,6 +11,11 @@ export default defineConfig({
     // runtime (dev-playground's `development`-condition source run) — tsconfig
     // paths don't apply there. Kept OUT of the client-safe root barrel because
     // it imports node:path (would break the docs client webpack bundle).
+    //
+    // DO NOT REMOVE this export: without it the dev-playground server fails to
+    // boot with ERR_PACKAGE_PATH_NOT_EXPORTED, which times out the "Playground
+    // Integration Tests" (Playwright) CI job. Build/typecheck/unit tests all
+    // still pass, so only that job catches its absence.
     "src/cli/commands/cache-paths.ts",
   ],
   outDir: "dist",