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/utils/grab-dir-names.js

@@ -1,14 +1,33 @@
 import path from "path";
+import { DistDirEnvName, resolveDistDir } from "./grab-dist-dir";
+let cached;
+/**
+ * # Project and artifact paths
+ * The dist directory comes from `BUNEXT_DIST_DIR`, which `setupDistDir()`
+ * sets from `--dist-dir` / `dist_dir` in the config. Call this where the
+ * paths are used, not at module load: a module loaded before
+ * `setupDistDir()` runs would keep the default directory.
+ */
 export default function grabDirNames() {
     if (global.BUNEXT_DIR_NAMES)
         return global.BUNEXT_DIR_NAMES;
+    const key = `${process.cwd()}\0${process.env[DistDirEnvName] || ""}`;
+    if (cached?.key !== key) {
+        cached = { key, dir_names: computeDirNames() };
+    }
+    return cached.dir_names;
+}
+function computeDirNames() {
     const ROOT_DIR = process.cwd();
     const SRC_DIR = path.join(ROOT_DIR, "src");
     const PAGES_DIR = path.join(SRC_DIR, "pages");
     const API_DIR = path.join(PAGES_DIR, "api");
     const PUBLIC_DIR = path.join(ROOT_DIR, "public");
     const CONFIG_FILE = path.join(ROOT_DIR, "bunext.config.ts");
-    const BUNX_CWD_DIR = path.resolve(ROOT_DIR, ".bunext");
+    const BUNX_CWD_DIR = resolveDistDir({
+        dist_dir: process.env[DistDirEnvName],
+        root_dir: ROOT_DIR,
+    });
     const BUNX_CWD_MODULE_CACHE_DIR = path.resolve(BUNX_CWD_DIR, "module-cache");
     const BUNX_CWD_PAGES_REWRITE_DIR = path.resolve(BUNX_CWD_DIR, "pages");
     const BUNX_TMP_DIR = path.resolve(BUNX_CWD_DIR, ".tmp");