fix(agents): load OpenCode reviewer from the Claude persona

.claude/README.md

@@ -4,5 +4,5 @@ Agent skills are canonical in `.agents/skills/` and shared across all harnesses
 
 ## Contents
 
-- `agents/` — Sub-agent persona definitions with Claude Code-specific frontmatter (`model`, `memory`, `color`, `tools`). The same personas exist in `.opencode/agents/` with OpenCode-specific config.
+- `agents/` — Sub-agent persona definitions with Claude Code-specific frontmatter (`model`, `memory`, `color`, `tools`). OpenCode loads these files through `{file:}` entries in `.opencode/opencode.jsonc`, so edit only the copy here.
 - `agent-memory/` — Persistent agent memory files. Claude Code runtime state, not portable across tools.

.opencode/opencode.jsonc

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "agents": {
+    // Loads the Claude Code persona so both harnesses share one prompt.
+    "principal-engineer-reviewer": {
+      "description": "Use this agent to review existing code, audit plans, evaluate product requirements, or get architectural guidance that balances pragmatism, user experience, and security. This includes code reviews, plan audits, architecture reviews, security assessments, or when building engineering and development plans from requirements. Use proactively after significant code changes or before merging.",
+      "mode": "subagent",
+      "system": "{file:../.claude/agents/principal-engineer-reviewer.md}",
+      "permissions": [{ "action": "edit", "resource": "*", "effect": "deny" }],
+    },
+  },
+}