Merge branch 'dev' into migrate-mcp-auth

Replace Bun-specific file operations with Filesystem module:

- Replace Bun.file().json() with Filesystem.readJson()

- Replace Bun.write() with Filesystem.writeJson() with mode 0o600

All 6 mcp tests pass.

packages/opencode/src/mcp/auth.ts

@@ -1,6 +1,7 @@
 import path from "path"
 import z from "zod"
 import { Global } from "../global"
+import { Filesystem } from "../util/filesystem"
 
 export namespace McpAuth {
   export const Tokens = z.object({
@@ -53,25 +54,22 @@ export namespace McpAuth {
   }
 
   export async function all(): Promise<Record<string, Entry>> {
-    const file = Bun.file(filepath)
-    return file.json().catch(() => ({}))
+    return Filesystem.readJson<Record<string, Entry>>(filepath).catch(() => ({}))
   }
 
   export async function set(mcpName: string, entry: Entry, serverUrl?: string): Promise<void> {
-    const file = Bun.file(filepath)
     const data = await all()
     // Always update serverUrl if provided
     if (serverUrl) {
       entry.serverUrl = serverUrl
     }
-    await Bun.write(file, JSON.stringify({ ...data, [mcpName]: entry }, null, 2), { mode: 0o600 })
+    await Filesystem.writeJson(filepath, { ...data, [mcpName]: entry }, 0o600)
   }
 
   export async function remove(mcpName: string): Promise<void> {
-    const file = Bun.file(filepath)
     const data = await all()
     delete data[mcpName]
-    await Bun.write(file, JSON.stringify(data, null, 2), { mode: 0o600 })
+    await Filesystem.writeJson(filepath, data, 0o600)
   }
 
   export async function updateTokens(mcpName: string, tokens: Tokens, serverUrl?: string): Promise<void> {

packages/opencode/src/shell/shell.ts

@@ -1,6 +1,5 @@
 import { Flag } from "@/flag/flag"
 import { lazy } from "@/util/lazy"
-import { Filesystem } from "@/util/filesystem"
 import path from "path"
 import { spawn, type ChildProcess } from "child_process"
 
@@ -44,7 +43,7 @@ export namespace Shell {
         // git.exe is typically at: C:\Program Files\Git\cmd\git.exe
         // bash.exe is at: C:\Program Files\Git\bin\bash.exe
         const bash = path.join(git, "..", "..", "bin", "bash.exe")
-        if (Filesystem.stat(bash)?.size) return bash
+        if (Bun.file(bash).size) return bash
       }
       return process.env.COMSPEC || "cmd.exe"
     }