dynamic workers docs (#3747)

* dynamic workers docs

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

src/docs/src/Workers/dynamic.md

@@ -0,0 +1,99 @@
+---
+title: Dynamic Workers
+description: Deploy server-side code from inside a hosted website by dropping a .worker.js file into a __workers folder, with no deploy step and no worker to register.
+platforms: [workers]
+---
+
+If you already [deploy your site to Puter](/deployments/#deploy-to-puter), dynamic workers let you add backend endpoints to it without managing workers separately.
+
+A dynamic worker is server-side code that lives inside your hosted site and deploys itself on demand. Drop a file at `__workers/api.worker.js` next to your `index.html`, publish the site as you normally would, and `https://your-site.puter.site/__workers/api/...` starts serving it. There is no deploy step of its own, no worker name to register, and nothing to keep in sync between the site and its backend.
+
+<div class="info">Dynamic workers are routed on <code>*.puter.site</code> only, and they don't appear in <code>puter.workers.list()</code> or the Developer Center. Read <a href="#limitations">Limitations</a> before you build on them.</div>
+
+## Comparison
+
+A regular [Serverless Worker](/Workers/) is a separate thing from the site that uses it: you deploy the worker, it gets its own `*.puter.work` subdomain, and from then on you keep the site and the worker in sync by hand — matching versions, updating URLs, remembering which worker belongs to which site.
+
+With a dynamic worker, the code is just a file in the site, so:
+
+- the site and its backend version together — same folder, same deploy, same backup;
+- the URL is derived from where the file lives, so there is nothing to wire up;
+- there is no worker record to create, rename, or clean up.
+
+The tradeoff is that there are fewer tools for working with them: they don't show up in [`puter.workers.list()`](/Workers/list/) or the Developer Center. See [Limitations](#limitations).
+
+## File Layout
+
+Inside the directory your site is hosted from, create a folder named `__workers`. Every file directly inside it whose name ends in `.worker.js` is a dynamic worker.
+
+```
+my-site/
+  index.html
+  style.css
+  __workers/
+    api.worker.js           -> /__workers/api/...
+    matchmaking.worker.js   -> /__workers/matchmaking/...
+```
+
+Two rules apply to the files:
+
+- **Top level only.** `__workers/nested/thing.worker.js` is never deployed. The URL has room for one worker name, so there would be no way to point at a file inside a subfolder.
+- **Allowed names.** The part before `.worker.js` must match `[a-z0-9_-]+` — lowercase letters, digits, underscore, hyphen. The name is also the URL path segment, so sticking to those characters keeps capitalization and URL encoding from getting in the way.
+
+Anything else under `__workers/` — a README, a nested folder, a `helpers.js` — is ignored. It is not deployed, and it is not served either.
+
+## Syntax
+
+Dynamic workers are written exactly like regular workers, with the same [`router`](/Workers/router/) API and the same globals:
+
+```js
+// __workers/api.worker.js
+router.get("/health", async () => {
+  return { ok: true };
+});
+
+router.post("/scores/:game", async ({ request, params }) => {
+  const body = await request.json();
+  await me.puter.kv.set(`score:${params.game}:${body.player}`, body.score);
+  return { saved: true };
+});
+```
+
+Everything in the [`router`](/Workers/router/) documentation applies unchanged: [route parameters](/Workers/router/#route-parameters), [wildcards](/Workers/router/#wildcard-routes), [`me.puter` and `user.puter`](/Workers/router/#integration-with-puter-js), [CORS](/Workers/router/#cors), and returning objects vs. a `Response`.
+
+## URLs and Path Mapping
+
+```
+https://<site>.puter.site/__workers/<worker>/<path>
+```
+
+The `/__workers/<worker>` prefix is stripped before the request reaches your code; the worker sees the remainder:
+
+| Request | Worker sees |
+| --- | --- |
+| `/__workers/api` | `/` |
+| `/__workers/api/` | `/` |
+| `/__workers/api/health` | `/health` |
+| `/__workers/api/scores/chess?top=10` | `/scores/chess?top=10` |
+
+Details worth knowing:
+
+- The worker segment is read from the **URL-decoded** path and lowercased, so `/__workers/API/x` and `/__workers/%61pi/x` both reach `api`.
+- The rest of the path keeps its original encoding — an encoded slash in your path stays encoded rather than becoming a real separator.
+- Query strings are preserved. Fragments never leave the browser.
+
+## Response Codes
+
+| Code | Meaning |
+| --- | --- |
+| `404` | No such worker file under the site's `__workers/`, or the file is in a subfolder or misnamed. |
+| `503` | The file exists but the worker could not be started. Worth retrying — it never means the worker isn't there. |
+| Your own | Anything your handler returns. |
+
+## Limitations
+
+**`puter.site` only.** Dynamic workers are routed on the primary hosting domain. The alternate hosting domain and `puter.app` (private apps) are not routed yet, and custom domains aren't supported.
+
+**Not listed by the Workers API.** [`puter.workers.list()`](/Workers/list/) and the Developer Center's Workers view do not show dynamic workers. They have no worker record by design: that's what saves you from keeping one in sync, and it's also why there's nothing to list.
+
+**One sandbox per site.** All of a site's workers share the same KV and AppData namespace, so they can read and write each other's data. That's intentional — it's how two workers in one site cooperate — but it means you can't keep one worker's data private from another in the same site.

src/docs/src/sidebar.js

@@ -487,6 +487,14 @@ let sidebar = [
                 source: '/Workers/types.md',
                 path: '/Workers/types',
             },
+            {
+                title: 'Dynamic Workers',
+                page_title: 'Dynamic Workers',
+                title_tag: 'Dynamic Workers',
+                icon: '/assets/img/object.svg',
+                source: '/Workers/dynamic.md',
+                path: '/Workers/dynamic',
+            },
             {
                 title: '<code>create()</code>',
                 page_title: '<code>puter.workers.create()</code>',