fix: stop publishing the API route (#588)

A Route Handler cannot be statically exported, and `buildWebsite` already leaves `src/app/api`
behind when it copies the app — so it only ever travelled as dead weight. With its test that is
37 kB, and `files` now says so, which is also what the copy's exclusion claimed to mirror.

`src/app/[...slug]/page.test.ts` still ships. Nothing under a bracketed directory can be
excluded through `files` under pnpm — proven on a four-file reproduction: `npm pack` honours
`!**/*.test.*` there, `pnpm pack` does not, and neither a directory negation nor an escaped
bracket reaches it.


Claude-Session: https://claude.ai/code/session_01HfCBpbazo3fr1n2EUXNyh5

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: abernier

.changeset/drop-api-route.md

@@ -0,0 +1,12 @@
+---
+'@pmndrs/docs': patch
+---
+
+Stop publishing `src/app/api`. A Route Handler cannot be statically exported, and the CLI
+already leaves it behind when it copies the app, so it only ever travelled as dead weight —
+37 kB of it, once its test is counted.
+
+One test file still ships, `src/app/[...slug]/page.test.ts`. Nothing under a bracketed
+directory can be excluded through `files` under `pnpm`, whatever the pattern: `npm pack` honours
+`!**/*.test.*` there, `pnpm pack` does not, and neither a directory negation nor an escaped
+bracket reaches it.

package.json

@@ -129,6 +129,7 @@
     "postcss.config.mjs",
     "tsconfig.json",
     "!src/stories",
+    "!src/app/api",
     "!**/*.test.*",
     "!**/*.stories.*"
   ]