refactor: apply minimal tfcode branding

- Rename packages/opencode → packages/tfcode (directory only)
- Rename bin/opencode → bin/tfcode (CLI binary)
- Rename .opencode → .tfcode (config directory)
- Update package.json name and bin field
- Update config directory path references (.tfcode)
- Keep internal code references as 'opencode' for easy upstream sync
- Keep @opencode-ai/* workspace package names

This minimal branding approach allows clean merges from upstream
opencode repository while providing tfcode branding for users.

packages/tfcode/test/fixture/skills/agents-sdk/SKILL.md

@@ -0,0 +1,152 @@
+---
+name: agents-sdk
+description: Build AI agents on Cloudflare Workers using the Agents SDK. Load when creating stateful agents, durable workflows, real-time WebSocket apps, scheduled tasks, MCP servers, or chat applications. Covers Agent class, state management, callable RPC, Workflows integration, and React hooks.
+---
+
+# Cloudflare Agents SDK
+
+**STOP.** Your knowledge of the Agents SDK may be outdated. Prefer retrieval over pre-training for any Agents SDK task.
+
+## Documentation
+
+Fetch current docs from `https://github.com/cloudflare/agents/tree/main/docs` before implementing.
+
+| Topic               | Doc                           | Use for                                        |
+| ------------------- | ----------------------------- | ---------------------------------------------- |
+| Getting started     | `docs/getting-started.md`     | First agent, project setup                     |
+| State               | `docs/state.md`               | `setState`, `validateStateChange`, persistence |
+| Routing             | `docs/routing.md`             | URL patterns, `routeAgentRequest`, `basePath`  |
+| Callable methods    | `docs/callable-methods.md`    | `@callable`, RPC, streaming, timeouts          |
+| Scheduling          | `docs/scheduling.md`          | `schedule()`, `scheduleEvery()`, cron          |
+| Workflows           | `docs/workflows.md`           | `AgentWorkflow`, durable multi-step tasks      |
+| HTTP/WebSockets     | `docs/http-websockets.md`     | Lifecycle hooks, hibernation                   |
+| Email               | `docs/email.md`               | Email routing, secure reply resolver           |
+| MCP client          | `docs/mcp-client.md`          | Connecting to MCP servers                      |
+| MCP server          | `docs/mcp-servers.md`         | Building MCP servers with `McpAgent`           |
+| Client SDK          | `docs/client-sdk.md`          | `useAgent`, `useAgentChat`, React hooks        |
+| Human-in-the-loop   | `docs/human-in-the-loop.md`   | Approval flows, pausing workflows              |
+| Resumable streaming | `docs/resumable-streaming.md` | Stream recovery on disconnect                  |
+
+Cloudflare docs: https://developers.cloudflare.com/agents/
+
+## Capabilities
+
+The Agents SDK provides:
+
+- **Persistent state** - SQLite-backed, auto-synced to clients
+- **Callable RPC** - `@callable()` methods invoked over WebSocket
+- **Scheduling** - One-time, recurring (`scheduleEvery`), and cron tasks
+- **Workflows** - Durable multi-step background processing via `AgentWorkflow`
+- **MCP integration** - Connect to MCP servers or build your own with `McpAgent`
+- **Email handling** - Receive and reply to emails with secure routing
+- **Streaming chat** - `AIChatAgent` with resumable streams
+- **React hooks** - `useAgent`, `useAgentChat` for client apps
+
+## FIRST: Verify Installation
+
+```bash
+npm ls agents  # Should show agents package
+```
+
+If not installed:
+
+```bash
+npm install agents
+```
+
+## Wrangler Configuration
+
+```jsonc
+{
+  "durable_objects": {
+    "bindings": [{ "name": "MyAgent", "class_name": "MyAgent" }],
+  },
+  "migrations": [{ "tag": "v1", "new_sqlite_classes": ["MyAgent"] }],
+}
+```
+
+## Agent Class
+
+```typescript
+import { Agent, routeAgentRequest, callable } from "agents"
+
+type State = { count: number }
+
+export class Counter extends Agent<Env, State> {
+  initialState = { count: 0 }
+
+  // Validation hook - runs before state persists (sync, throwing rejects the update)
+  validateStateChange(nextState: State, source: Connection | "server") {
+    if (nextState.count < 0) throw new Error("Count cannot be negative")
+  }
+
+  // Notification hook - runs after state persists (async, non-blocking)
+  onStateUpdate(state: State, source: Connection | "server") {
+    console.log("State updated:", state)
+  }
+
+  @callable()
+  increment() {
+    this.setState({ count: this.state.count + 1 })
+    return this.state.count
+  }
+}
+
+export default {
+  fetch: (req, env) => routeAgentRequest(req, env) ?? new Response("Not found", { status: 404 }),
+}
+```
+
+## Routing
+
+Requests route to `/agents/{agent-name}/{instance-name}`:
+
+| Class      | URL                        |
+| ---------- | -------------------------- |
+| `Counter`  | `/agents/counter/user-123` |
+| `ChatRoom` | `/agents/chat-room/lobby`  |
+
+Client: `useAgent({ agent: "Counter", name: "user-123" })`
+
+## Core APIs
+
+| Task                | API                                                    |
+| ------------------- | ------------------------------------------------------ |
+| Read state          | `this.state.count`                                     |
+| Write state         | `this.setState({ count: 1 })`                          |
+| SQL query           | `` this.sql`SELECT * FROM users WHERE id = ${id}` ``   |
+| Schedule (delay)    | `await this.schedule(60, "task", payload)`             |
+| Schedule (cron)     | `await this.schedule("0 * * * *", "task", payload)`    |
+| Schedule (interval) | `await this.scheduleEvery(30, "poll")`                 |
+| RPC method          | `@callable() myMethod() { ... }`                       |
+| Streaming RPC       | `@callable({ streaming: true }) stream(res) { ... }`   |
+| Start workflow      | `await this.runWorkflow("ProcessingWorkflow", params)` |
+
+## React Client
+
+```tsx
+import { useAgent } from "agents/react"
+
+function App() {
+  const [state, setLocalState] = useState({ count: 0 })
+
+  const agent = useAgent({
+    agent: "Counter",
+    name: "my-instance",
+    onStateUpdate: (newState) => setLocalState(newState),
+    onIdentity: (name, agentType) => console.log(`Connected to ${name}`),
+  })
+
+  return <button onClick={() => agent.setState({ count: state.count + 1 })}>Count: {state.count}</button>
+}
+```
+
+## References
+
+- **[references/workflows.md](references/workflows.md)** - Durable Workflows integration
+- **[references/callable.md](references/callable.md)** - RPC methods, streaming, timeouts
+- **[references/state-scheduling.md](references/state-scheduling.md)** - State persistence, scheduling
+- **[references/streaming-chat.md](references/streaming-chat.md)** - AIChatAgent, resumable streams
+- **[references/mcp.md](references/mcp.md)** - MCP server integration
+- **[references/email.md](references/email.md)** - Email routing and handling
+- **[references/codemode.md](references/codemode.md)** - Code Mode (experimental)

packages/tfcode/test/fixture/skills/agents-sdk/references/callable.md

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+# Callable Methods
+
+Fetch `docs/callable-methods.md` from `https://github.com/cloudflare/agents/tree/main/docs` for complete documentation.
+
+## Overview
+
+`@callable()` exposes agent methods to clients via WebSocket RPC.
+
+```typescript
+import { Agent, callable } from "agents"
+
+export class MyAgent extends Agent<Env, State> {
+  @callable()
+  async greet(name: string): Promise<string> {
+    return `Hello, ${name}!`
+  }
+
+  @callable()
+  async processData(data: unknown): Promise<Result> {
+    // Long-running work
+    return result
+  }
+}
+```
+
+## Client Usage
+
+```typescript
+// Basic call
+const greeting = await agent.call("greet", ["World"])
+
+// With timeout
+const result = await agent.call("processData", [data], {
+  timeout: 5000, // 5 second timeout
+})
+```
+
+## Streaming Responses
+
+```typescript
+import { Agent, callable, StreamingResponse } from "agents"
+
+export class MyAgent extends Agent<Env, State> {
+  @callable({ streaming: true })
+  async streamResults(stream: StreamingResponse, query: string) {
+    for await (const item of fetchResults(query)) {
+      stream.send(JSON.stringify(item))
+    }
+    stream.close()
+  }
+
+  @callable({ streaming: true })
+  async streamWithError(stream: StreamingResponse) {
+    try {
+      // ... work
+    } catch (error) {
+      stream.error(error.message) // Signal error to client
+      return
+    }
+    stream.close()
+  }
+}
+```
+
+Client with streaming:
+
+```typescript
+await agent.call("streamResults", ["search term"], {
+  stream: {
+    onChunk: (data) => console.log("Chunk:", data),
+    onDone: () => console.log("Complete"),
+    onError: (error) => console.error("Error:", error),
+  },
+})
+```
+
+## Introspection
+
+```typescript
+// Get list of callable methods on an agent
+const methods = await agent.call("getCallableMethods", [])
+// Returns: ["greet", "processData", "streamResults", ...]
+```
+
+## When to Use
+
+| Scenario                             | Use                         |
+| ------------------------------------ | --------------------------- |
+| Browser/mobile calling agent         | `@callable()`               |
+| External service calling agent       | `@callable()`               |
+| Worker calling agent (same codebase) | DO RPC directly             |
+| Agent calling another agent          | `getAgentByName()` + DO RPC |