fix(guardrails): plugin config missing — runtime loading broken

[terisuke]

Problem

The guardrails plugin (guardrail.ts, team.ts) exists in packages/guardrails/profile/plugins/ but was never registered in opencode.json's plugin field.

Impact: At runtime via the binary, the guardrails plugin is never loaded. All hooks (21+ hooks, 1184 lines) are dead code at runtime.

Why tests passed: Scenario tests call Plugin.trigger() directly, bypassing config-based plugin loading. This masked the issue since Wave 1.

Root Cause

The plugin field in opencode.json drives plugin_origins in the config system, which feeds PluginLoader.loadExternal(). Without this field, the plugin loader receives an empty list.

Fix

Add "plugin": ["./plugins/guardrail.ts", "./plugins/team.ts"] to packages/guardrails/profile/opencode.json.

Verification

• opencode debug config --print-logs → loading plugin path=file:///...guardrail.ts confirmed
• Integration test: plugin discovery → session.created → state init → hard blocks → env vars