fix: don't emit invalid "embedding" output modality (crashes TUI on startup)

[aluzed]

Problem

After updating OpenCode (reproduced on 1.16.2), the TUI crashes on startup with:

config.get: Expected "text" | "audio" | "image" | "video" | "pdf", got "embedding"
  at ["provider"]["lmstudio"]["models"]["text-embedding-...""]["modalities"]["output"][0]
... tui bootstrap failed

Recent OpenCode releases tightened model-config schema validation. The plugin sets modalities.output = ["embedding"] for embedding models in enhance-config.ts, but embedding is no longer an accepted modality value — so the whole config fails validation and OpenCode refuses to boot whenever LM Studio exposes an embedding model (e.g. text-embedding-nomic-embed-text-v1.5).

Fix

Register embedding models without an explicit modalities field, letting OpenCode apply its defaults instead of rejecting the config. Chat models are unaffected. Embedding models are still discovered and counted (the "only embedding models found" guidance still works).

Verification

• npm run typecheck ✅
• npm run test:run ✅ (16/16)
• Reproduced the crash locally with an LM Studio instance exposing an embedding model, then confirmed the fix: no more schema rejection / tui bootstrap failed, providers initialize, and chat models resolve and reach LM Studio.

🤖 Generated with Claude Code