refactor: migrate src/tool/edit.ts from Bun.file() to Filesystem module

Replace Bun.file() and Bun.write() usage with Filesystem module and fs/promises:

- Replace Bun.file(filepath).exists() with Filesystem.exists()

- Replace Bun.file(filepath).stat() with stat() from fs/promises

- Replace Bun.file(filepath).text() with Filesystem.readText()

- Replace Bun.file(filepath).write() with Filesystem.write()

- Replace Bun.write() with Filesystem.write()

All 17 tests pass for the edit tool.

packages/opencode/src/tool/edit.ts

@@ -5,6 +5,7 @@
 
 import z from "zod"
 import * as path from "path"
+import { stat } from "fs/promises"
 import { Tool } from "./tool"
 import { LSP } from "../lsp"
 import { createTwoFilesPatch, diffLines } from "diff"
@@ -49,7 +50,7 @@ export const EditTool = Tool.define("edit", {
     let contentNew = ""
     await FileTime.withLock(filePath, async () => {
       if (params.oldString === "") {
-        const existed = await Bun.file(filePath).exists()
+        const existed = await Filesystem.exists(filePath)
         contentNew = params.newString
         diff = trimDiff(createTwoFilesPatch(filePath, filePath, contentOld, contentNew))
         await ctx.ask({
@@ -61,7 +62,7 @@ export const EditTool = Tool.define("edit", {
             diff,
           },
         })
-        await Bun.write(filePath, params.newString)
+        await Filesystem.write(filePath, params.newString)
         await Bus.publish(File.Event.Edited, {
           file: filePath,
         })
@@ -73,12 +74,11 @@ export const EditTool = Tool.define("edit", {
         return
       }
 
-      const file = Bun.file(filePath)
-      const stats = await file.stat().catch(() => {})
+      const stats = await stat(filePath).catch(() => {})
       if (!stats) throw new Error(`File ${filePath} not found`)
       if (stats.isDirectory()) throw new Error(`Path is a directory, not a file: ${filePath}`)
       await FileTime.assert(ctx.sessionID, filePath)
-      contentOld = await file.text()
+      contentOld = await Filesystem.readText(filePath)
       contentNew = replace(contentOld, params.oldString, params.newString, params.replaceAll)
 
       diff = trimDiff(
@@ -94,7 +94,7 @@ export const EditTool = Tool.define("edit", {
         },
       })
 
-      await file.write(contentNew)
+      await Filesystem.write(filePath, contentNew)
       await Bus.publish(File.Event.Edited, {
         file: filePath,
       })
@@ -102,7 +102,7 @@ export const EditTool = Tool.define("edit", {
         file: filePath,
         event: "change",
       })
-      contentNew = await file.text()
+      contentNew = await Filesystem.readText(filePath)
       diff = trimDiff(
         createTwoFilesPatch(filePath, filePath, normalizeLineEndings(contentOld), normalizeLineEndings(contentNew)),
       )