add opencode review plugin (port from pi-coding-agent extension)

.opencode/commands/review.md

@@ -0,0 +1,25 @@
+---
+description: Review code changes (working-copy, bookmark, change, PR, or folder)
+agent: review
+subtask: true
+---
+
+Review the following code changes. $ARGUMENTS
+
+Current repository state:
+
+```
+!`jj log -r '::@ ~ ::trunk()' -n 15 --no-graph -T 'change_id.shortest(8) ++ " " ++ coalesce(bookmarks, "") ++ " " ++ description.first_line() ++ "\n"' 2>/dev/null || echo "Not a jj repository or no divergence from trunk"`
+```
+
+Working copy status:
+
+```
+!`jj diff --summary 2>/dev/null || echo "No working-copy changes"`
+```
+
+Available bookmarks:
+
+```
+!`jj bookmark list --all-remotes -T 'name ++ if(remote, "@" ++ remote, "") ++ "\n"' 2>/dev/null | head -20 || echo "No bookmarks"`
+```