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/file/ripgrep.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, test } from "bun:test"
+import fs from "fs/promises"
+import path from "path"
+import { tmpdir } from "../fixture/fixture"
+import { Ripgrep } from "../../src/file/ripgrep"
+
+describe("file.ripgrep", () => {
+  test("defaults to include hidden", async () => {
+    await using tmp = await tmpdir({
+      init: async (dir) => {
+        await Bun.write(path.join(dir, "visible.txt"), "hello")
+        await fs.mkdir(path.join(dir, ".opencode"), { recursive: true })
+        await Bun.write(path.join(dir, ".opencode", "thing.json"), "{}")
+      },
+    })
+
+    const files = await Array.fromAsync(Ripgrep.files({ cwd: tmp.path }))
+    const hasVisible = files.includes("visible.txt")
+    const hasHidden = files.includes(path.join(".opencode", "thing.json"))
+    expect(hasVisible).toBe(true)
+    expect(hasHidden).toBe(true)
+  })
+
+  test("hidden false excludes hidden", async () => {
+    await using tmp = await tmpdir({
+      init: async (dir) => {
+        await Bun.write(path.join(dir, "visible.txt"), "hello")
+        await fs.mkdir(path.join(dir, ".opencode"), { recursive: true })
+        await Bun.write(path.join(dir, ".opencode", "thing.json"), "{}")
+      },
+    })
+
+    const files = await Array.fromAsync(Ripgrep.files({ cwd: tmp.path, hidden: false }))
+    const hasVisible = files.includes("visible.txt")
+    const hasHidden = files.includes(path.join(".opencode", "thing.json"))
+    expect(hasVisible).toBe(true)
+    expect(hasHidden).toBe(false)
+  })
+
+  test("search returns empty when nothing matches", async () => {
+    await using tmp = await tmpdir({
+      init: async (dir) => {
+        await Bun.write(path.join(dir, "match.ts"), "const value = 'other'\n")
+      },
+    })
+
+    const hits = await Ripgrep.search({
+      cwd: tmp.path,
+      pattern: "needle",
+    })
+
+    expect(hits).toEqual([])
+  })
+})