feat: Launch OpenCode sessions from Agent Workbench

[afaf-tech]

Summary

Add OpenCode as a launchable session type in Lovcode's Agent Workbench, allowing users to start OpenCode TUI/CLI sessions directly from the Lovcode UI.

Motivation

Lovcode's Agent Workbench currently lets users launch:

• Claude Code sessions
• Codex sessions
• Terminal sessions
• General chat sessions

OpenCode is missing. Users who work with OpenCode have to leave Lovcode to start their sessions, breaking the "single command center" experience.

Proposed Feature

• "OpenCode" tile in the Agent Workbench launcher, alongside Claude Code and Codex
• Project context passthrough — when launching from a selected project, set the working directory and pass project context
• Model selection — allow picking from OpenCode's configured providers/models before launch
• Mode toggle — option to launch in TUI mode (default, interactive) or headless mode (opencode run -p "...")
• Session tracking — launched sessions are tracked so their history can be viewed later in Lovcode

Technical Notes

• TUI launch: opencode (needs terminal emulator — Lovcode already handles this for Claude Code/Codex)
• Headless launch: opencode run -p "<prompt>"
• Server mode: opencode serve --port 4096 (could also support attaching to running servers)
• Project-level config (opencode.json) could be auto-detected

UI Suggestion

The Agent Workbench tile could show:

• OpenCode icon/logo
• Currently configured default model
• Number of existing sessions for this project

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🤖 Generated with Claude Code