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/control-plane/workspace-sync.test.ts

@@ -0,0 +1,99 @@
+import { afterEach, describe, expect, mock, test } from "bun:test"
+import { WorkspaceID } from "../../src/control-plane/schema"
+import { Log } from "../../src/util/log"
+import { tmpdir } from "../fixture/fixture"
+import { Project } from "../../src/project/project"
+import { Database } from "../../src/storage/db"
+import { WorkspaceTable } from "../../src/control-plane/workspace.sql"
+import { GlobalBus } from "../../src/bus/global"
+import { resetDatabase } from "../fixture/db"
+import * as adaptors from "../../src/control-plane/adaptors"
+import type { Adaptor } from "../../src/control-plane/types"
+
+afterEach(async () => {
+  mock.restore()
+  await resetDatabase()
+})
+
+Log.init({ print: false })
+
+const remote = { type: "testing", name: "remote-a" } as unknown as typeof WorkspaceTable.$inferInsert
+
+const TestAdaptor: Adaptor = {
+  configure(config) {
+    return config
+  },
+  async create() {
+    throw new Error("not used")
+  },
+  async remove() {},
+  async fetch(_config: unknown, _input: RequestInfo | URL, _init?: RequestInit) {
+    const body = new ReadableStream<Uint8Array>({
+      start(controller) {
+        const encoder = new TextEncoder()
+        controller.enqueue(encoder.encode('data: {"type":"remote.ready","properties":{}}\n\n'))
+        controller.close()
+      },
+    })
+    return new Response(body, {
+      status: 200,
+      headers: {
+        "content-type": "text/event-stream",
+      },
+    })
+  },
+}
+
+adaptors.installAdaptor("testing", TestAdaptor)
+
+describe("control-plane/workspace.startSyncing", () => {
+  test("syncs only remote workspaces and emits remote SSE events", async () => {
+    const { Workspace } = await import("../../src/control-plane/workspace")
+    await using tmp = await tmpdir({ git: true })
+    const { project } = await Project.fromDirectory(tmp.path)
+
+    const id1 = WorkspaceID.ascending()
+    const id2 = WorkspaceID.ascending()
+
+    Database.use((db) =>
+      db
+        .insert(WorkspaceTable)
+        .values([
+          {
+            id: id1,
+            branch: "main",
+            project_id: project.id,
+            type: remote.type,
+            name: remote.name,
+          },
+          {
+            id: id2,
+            branch: "main",
+            project_id: project.id,
+            type: "worktree",
+            directory: tmp.path,
+            name: "local",
+          },
+        ])
+        .run(),
+    )
+
+    const done = new Promise<void>((resolve) => {
+      const listener = (event: { directory?: string; payload: { type: string } }) => {
+        if (event.directory !== id1) return
+        if (event.payload.type !== "remote.ready") return
+        GlobalBus.off("event", listener)
+        resolve()
+      }
+      GlobalBus.on("event", listener)
+    })
+
+    const sync = Workspace.startSyncing(project)
+    await Promise.race([
+      done,
+      new Promise((_, reject) => setTimeout(() => reject(new Error("timed out waiting for sync event")), 2000)),
+    ])
+
+    await sync.stop()
+  })
+})