opencode stats writes a raw cursor-up escape when output is not a terminal

Description

opencode stats closes its MODEL USAGE box by printing a separator after every model and then erasing the last one with a cursor-up escape:

packages/opencode/src/cli/cmd/stats.ts:340-352

for (const [model, usage] of modelsToDisplay) {
  console.log(`│ ${model.padEnd(54)} │`)
  ...
  console.log("├────────────────────────────────────────────────────────┤")
}
// Remove last separator and add bottom border
process.stdout.write("\x1B[1A") // Move up one line
console.log("└────────────────────────────────────────────────────────┘")

\x1B[1A only erases anything on a terminal. It is written unconditionally — there is no isTTY check anywhere in the file — so as soon as stdout is not a terminal the escape becomes literal bytes in the output and the separator it was meant to overwrite survives.

Redirecting or piping the command (opencode stats > stats.txt, opencode stats | less, capturing it from a script or CI job) produces a broken box with a raw control character in it. Reproduced with the exact print sequence:

# current
│ modelA                                                 │
├────────────────────────────────────────────────────────┤
│ modelB                                                 │
├────────────────────────────────────────────────────────┤     <- should not be here
^[[1A└────────────────────────────────────────────────────────┘  <- literal ESC[1A

# expected
│ modelA                                                 │
├────────────────────────────────────────────────────────┤
│ modelB                                                 │
└────────────────────────────────────────────────────────┘

The other two boxes in this command (OVERVIEW, COST & TOKENS) do not need the trick because they have a fixed row count. Only MODEL USAGE loops.

Printing the separator before each entry except the first removes the need for the escape entirely and produces byte-identical output on a terminal.

Steps to reproduce

1. opencode stats --models 2 > out.txt (or pipe it anywhere that is not a TTY).
2. cat -v out.txt — the final line begins with ^[[1A and the separator above it was never removed.

Operating System

Windows 11 (platform independent — the escape is written regardless of platform)