[BUG] Variant label missing from chat header after opencode self-update

Description

After opencode auto-updated its binary, the variant label no longer appears in the chat header. The variant is still correctly set in model.json and shows in the input area selector, but the chat header drops it.

Before (working)

▣ Sisyphus - Ultraworker · DeepSeek V4 Flash Free (New) · high · 16m 20s

After (broken)

▣ Sisyphus - Ultraworker · DeepSeek V4 Flash Free (New) · 16m 20s

The variant "high" is missing from the chat header.

Expected

Variant label appears in chat header alongside model name and duration

Actual

Variant label is dropped from chat header (but still shows in input selector)

Plugins

oh-my-openagent; opencode-model-discovery

OpenCode version

1.18.14

Steps to reproduce

1. Set a variant in model.json (e.g., "high") - confirmed set at C:\Users\LuC!F3R\.local\state\opencode\model.json
2. Select that model, and its variant in chat
3. Send a prompt in opencode
4. Observe the chat header -> variant is omitted in chat response generated, but exists in the input header

Screenshot and/or share link

Operating System

Windows 11

Terminal

Powershell 7 on Windows Terminal