feat: add bun-fullstack agent and update skills

.opencode/skills/tech-stack/elysiajs/references/eden.md

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+# Eden Treaty
+e2e type safe RPC client for share type from backend to frontend.
+
+## What It Is
+Type-safe object representation for Elysia server. Auto-completion + error handling.
+
+## Installation
+```bash
+bun add @elysiajs/eden
+bun add -d elysia
+```
+
+Export Elysia server type:
+```typescript
+const app = new Elysia()
+    .get('/', () => 'Hi Elysia')
+    .get('/id/:id', ({ params: { id } }) => id)
+    .post('/mirror', ({ body }) => body, {
+        body: t.Object({
+            id: t.Number(),
+            name: t.String()
+        })
+    })
+    .listen(3000)
+
+export type App = typeof app
+```
+
+Consume on client side:
+```typescript
+import { treaty } from '@elysiajs/eden'
+import type { App } from './server'
+
+const client = treaty<App>('localhost:3000')
+
+// response: Hi Elysia
+const { data: index } = await client.get()
+
+// response: 1895
+const { data: id } = await client.id({ id: 1895 }).get()
+
+// response: { id: 1895, name: 'Skadi' }
+const { data: nendoroid } = await client.mirror.post({
+    id: 1895,
+    name: 'Skadi'
+})
+```
+
+## Common Errors & Fixes
+- **Strict mode**: Enable in tsconfig
+- **Version mismatch**: `npm why elysia` - must match server/client
+- **TypeScript**: Min 5.0
+- **Method chaining**: Required on server
+- **Bun types**: `bun add -d @types/bun` if using Bun APIs
+- **Path alias**: Must resolve same on frontend/backend
+
+### Monorepo Path Alias
+Must resolve to same file on frontend/backend
+
+```json
+// tsconfig.json at root
+{
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@frontend/*": ["./apps/frontend/src/*"],
+      "@backend/*": ["./apps/backend/src/*"]
+    }
+  }
+}
+```
+
+## Syntax Mapping
+| Path           | Method | Treaty                        |
+|----------------|--------|-------------------------------|
+| /              | GET    | `.get()`                      |
+| /hi            | GET    | `.hi.get()`                   |
+| /deep/nested   | POST   | `.deep.nested.post()`         |
+| /item/:name    | GET    | `.item({ name: 'x' }).get()`  |
+
+## Parameters
+
+### With body (POST/PUT/PATCH/DELETE):
+```typescript
+.user.post(
+  { name: 'Elysia' },              // body
+  { headers: {}, query: {}, fetch: {} } // optional
+)
+```
+
+### No body (GET/HEAD):
+```typescript
+.hello.get({ headers: {}, query: {}, fetch: {} })
+```
+
+### Empty body with query/headers:
+```typescript
+.user.post(null, { query: { name: 'Ely' } })
+```
+
+### Fetch options:
+```typescript
+.hello.get({ fetch: { signal: controller.signal } })
+```
+
+### File upload:
+```typescript
+// Accepts: File | File[] | FileList | Blob
+.image.post({
+  title: 'Title',
+  image: fileInput.files!
+})
+```
+
+## Response
+```typescript
+const { data, error, response, status, headers } = await api.user.post({ name: 'x' })
+
+if (error) {
+  switch (error.status) {
+    case 400: throw error.value
+    default: throw error.value
+  }
+}
+// data unwrapped after error handling
+return data
+```
+
+status >= 300 → `data = null`, `error` has value
+
+## Stream/SSE
+Interpreted as `AsyncGenerator`:
+```typescript
+const { data, error } = await treaty(app).ok.get()
+if (error) throw error
+
+for await (const chunk of data) console.log(chunk)
+```
+
+## Utility Types
+```typescript
+import { Treaty } from '@elysiajs/eden'
+
+type UserData = Treaty.Data<typeof api.user.post>
+type UserError = Treaty.Error<typeof api.user.post>
+```
+
+## WebSocket
+```typescript
+const chat = api.chat.subscribe()
+
+chat.subscribe((message) => console.log('got', message))
+chat.on('open', () => chat.send('hello'))
+
+// Native access: chat.raw
+```
+
+`.subscribe()` accepts same params as `get`/`head`