Feature Request: DAP Debugger Integration & Advisor Model

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Describe the enhancement you want to request

Feature 1: DAP Debugger Integration

Inspired by: oh-my-pi (omp)

omp integrates the Debug Adapter Protocol (DAP) to drive real debuggers — lldb, delve (dlv), debugpy — with support for breakpoints, stepping, threads, stack frames, and variable inspection (28 DAP operations). The agent can attach to a running process, pause execution, inspect state, and continue — all without the developer leaving the terminal.

Proposed implementation

• Add a debug tool that connects to DAP-compatible adapters
• Support breakpoint management (set, list, remove)
• Implement stepping (continue, step over, step into, step out)
• Expose threads, stack frames, and scoped variables
• Allow the agent to evaluate expressions in the debug context

Why this matters

Most coding agents stop at "add print statements." A built-in debugger would let OpenCode diagnose crashes, inspect runtime state, and fix logic errors autonomously — a significant capability gap vs. omp.

Feature 2: Advisor / Reviewer Model

Inspired by: oh-my-pi (omp)

omp supports a secondary advisor model that silently observes every turn the main agent takes. It runs on its own context and model, injecting inline notes — a quiet aside, a concern, or a hard blocker — when the primary agent misses something.

Proposed implementation

• Add an advisor configuration section in opencode.json to specify a secondary model
• The advisor reads each turn (user prompt + agent response) in the background
• It can emit structured feedback: info, concern, or blocker
• Feedback is rendered inline in the TUI
• The main agent can optionally auto-incorporate feedback

Why this matters

A second set of eyes catches edge cases, security issues, and logical errors the primary agent rushed past. Especially valuable for complex multi-step tasks.

Both features are inspired by oh-my-pi (omp)