1.4.0: not_found, server-only response options, compression

- Server functions can return not_found: true to render the 404 page
  with status 404.
- Page components and window.__PAGE_PROPS__ (and HMR updates) only get
  props, query, url and error. response_options, redirect, cache settings
  and res_transform stay on the server, so cookies and private headers no
  longer end up in the HTML. BunextPageProps is narrowed to match
  (breaking for code that read server-only fields from component props).
- response_options headers go through a Headers object, so repeated
  headers such as several Set-Cookie survive.
- Redirects: status_code wins over permanent; response_options headers
  and res_transform apply to redirects too.
- Gzip for compressible text responses; compress: false to turn it off.
- Files the router matches but never bundles (.server.ts, __root,
  excluded paths and directories) return 404 instead of looping through
  dev rebuild retries.
- Missing public files return 404 rather than 403, so dotted page paths
  like /users/john.doe fall through to pages again.
- importFresh detects rewrites within the filesystem's mtime granularity.
- README: self-hosted React (not esm.sh), snake_case option names, static
  file serving, cache headers, the new options.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/commands/dev/dev-spawn.js

@@ -4,7 +4,6 @@ import bunextInit from "../../functions/bunext-init";
 import grabDirNames from "../../utils/grab-dir-names";
 import writeErrorFile from "../../functions/write-error-file";
 import { rmSync } from "fs";
-const { HYDRATION_DST_DIR, BUNX_CWD_PAGES_REWRITE_DIR } = grabDirNames();
 // The supervisor only restarts the dev server when this process actually
 // exits with a code. Registering a listener that merely logs (the previous
 // behavior) keeps Bun from exiting: the crash is swallowed, no error file is
@@ -22,6 +21,8 @@ process.on("unhandledRejection", (reason) => {
 });
 log.info("Running development server ...");
 try {
+    // The dist directory comes from the parent (`BUNEXT_DIST_DIR`).
+    const { HYDRATION_DST_DIR, BUNX_CWD_PAGES_REWRITE_DIR } = grabDirNames();
     rmSync(HYDRATION_DST_DIR, { recursive: true });
     rmSync(BUNX_CWD_PAGES_REWRITE_DIR, { recursive: true });
 }