fix: flaky shell test

packages/opencode/src/session/prompt.ts

@@ -787,6 +787,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
       const shellName = (
         process.platform === "win32" ? path.win32.basename(sh, ".exe") : path.basename(sh)
       ).toLowerCase()
+      const cwd = ctx.directory
       const invocations: Record<string, { args: string[] }> = {
         nu: { args: ["-c", input.command] },
         fish: { args: ["-c", input.command] },
@@ -795,12 +796,13 @@ NOTE: At any point in time through this workflow you should feel free to ask the
             "-l",
             "-c",
             `
-              __oc_cwd=$PWD
               [[ -f ~/.zshenv ]] && source ~/.zshenv >/dev/null 2>&1 || true
               [[ -f "\${ZDOTDIR:-$HOME}/.zshrc" ]] && source "\${ZDOTDIR:-$HOME}/.zshrc" >/dev/null 2>&1 || true
-              cd "$__oc_cwd"
+              cd -- "$1"
               eval ${JSON.stringify(input.command)}
             `,
+            "opencode",
+            cwd,
           ],
         },
         bash: {
@@ -808,12 +810,13 @@ NOTE: At any point in time through this workflow you should feel free to ask the
             "-l",
             "-c",
             `
-              __oc_cwd=$PWD
               shopt -s expand_aliases
               [[ -f ~/.bashrc ]] && source ~/.bashrc >/dev/null 2>&1 || true
-              cd "$__oc_cwd"
+              cd -- "$1"
               eval ${JSON.stringify(input.command)}
             `,
+            "opencode",
+            cwd,
           ],
         },
         cmd: { args: ["/c", input.command] },
@@ -823,7 +826,6 @@ NOTE: At any point in time through this workflow you should feel free to ask the
       }
 
       const args = (invocations[shellName] ?? invocations[""]).args
-      const cwd = ctx.directory
       const shellEnv = yield* plugin.trigger(
         "shell.env",
         { cwd, sessionID: input.sessionID, callID: part.callID },