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/functions/setup-dist-dir.js

@@ -0,0 +1,34 @@
+import { existsSync } from "fs";
+import grabDirNames from "../utils/grab-dir-names";
+import { DistDirEnvName, resolveDistDir } from "../utils/grab-dist-dir";
+/**
+ * # Set the dist directory for this process and its children
+ * Precedence: `params.dist_dir` (the CLI's `--dist-dir`), then an existing
+ * `BUNEXT_DIST_DIR` env var, then `dist_dir` from bunext.config.ts. Stores
+ * the absolute path in `BUNEXT_DIST_DIR`, which `grabDirNames()` reads and
+ * child processes inherit. Runs at the start of every CLI command and of
+ * `bunextInit()`, before anything reads the artifact paths. Throws on an
+ * invalid directory.
+ */
+export default async function setupDistDir(params) {
+    const root_dir = process.cwd();
+    const dist_dir = params?.dist_dir ||
+        process.env[DistDirEnvName] ||
+        (await grabConfigDistDir());
+    if (!dist_dir)
+        return;
+    process.env[DistDirEnvName] = resolveDistDir({ dist_dir, root_dir });
+}
+async function grabConfigDistDir() {
+    const { CONFIG_FILE } = grabDirNames();
+    if (!existsSync(CONFIG_FILE))
+        return;
+    try {
+        const config = (await import(CONFIG_FILE)).default;
+        return config?.dist_dir;
+    }
+    catch (error) {
+        // The config is loaded again later, which reports the error.
+        return;
+    }
+}