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/src/cli/cmd/debug/file.ts

@@ -0,0 +1,97 @@
+import { EOL } from "os"
+import { File } from "../../../file"
+import { bootstrap } from "../../bootstrap"
+import { cmd } from "../cmd"
+import { Ripgrep } from "@/file/ripgrep"
+
+const FileSearchCommand = cmd({
+  command: "search <query>",
+  describe: "search files by query",
+  builder: (yargs) =>
+    yargs.positional("query", {
+      type: "string",
+      demandOption: true,
+      description: "Search query",
+    }),
+  async handler(args) {
+    await bootstrap(process.cwd(), async () => {
+      const results = await File.search({ query: args.query })
+      process.stdout.write(results.join(EOL) + EOL)
+    })
+  },
+})
+
+const FileReadCommand = cmd({
+  command: "read <path>",
+  describe: "read file contents as JSON",
+  builder: (yargs) =>
+    yargs.positional("path", {
+      type: "string",
+      demandOption: true,
+      description: "File path to read",
+    }),
+  async handler(args) {
+    await bootstrap(process.cwd(), async () => {
+      const content = await File.read(args.path)
+      process.stdout.write(JSON.stringify(content, null, 2) + EOL)
+    })
+  },
+})
+
+const FileStatusCommand = cmd({
+  command: "status",
+  describe: "show file status information",
+  builder: (yargs) => yargs,
+  async handler() {
+    await bootstrap(process.cwd(), async () => {
+      const status = await File.status()
+      process.stdout.write(JSON.stringify(status, null, 2) + EOL)
+    })
+  },
+})
+
+const FileListCommand = cmd({
+  command: "list <path>",
+  describe: "list files in a directory",
+  builder: (yargs) =>
+    yargs.positional("path", {
+      type: "string",
+      demandOption: true,
+      description: "File path to list",
+    }),
+  async handler(args) {
+    await bootstrap(process.cwd(), async () => {
+      const files = await File.list(args.path)
+      process.stdout.write(JSON.stringify(files, null, 2) + EOL)
+    })
+  },
+})
+
+const FileTreeCommand = cmd({
+  command: "tree [dir]",
+  describe: "show directory tree",
+  builder: (yargs) =>
+    yargs.positional("dir", {
+      type: "string",
+      description: "Directory to tree",
+      default: process.cwd(),
+    }),
+  async handler(args) {
+    const files = await Ripgrep.tree({ cwd: args.dir, limit: 200 })
+    console.log(JSON.stringify(files, null, 2))
+  },
+})
+
+export const FileCommand = cmd({
+  command: "file",
+  describe: "file system debugging utilities",
+  builder: (yargs) =>
+    yargs
+      .command(FileReadCommand)
+      .command(FileStatusCommand)
+      .command(FileListCommand)
+      .command(FileSearchCommand)
+      .command(FileTreeCommand)
+      .demandCommand(),
+  async handler() {},
+})