Update agent roles and AGENTS.md for open-coordinator and open-memory plugins

Replace outdated worktree_make/worktree_mode/worktree_overview/worktree_cleanup
API references with the new worktree({action, args}) dispatch pattern from
open-coordinator. Add worktree notify tool for implementation/code-review/POC
agents to communicate back to coordinator. Fix stale alkhub_ts paths. Add
open-memory plugin awareness (memory, memory_compact) to AGENTS.md and agent
specs. Update sdd_process.md coordinator section accordingly.

.opencode/agents/code-reviewer.md

@@ -16,6 +16,18 @@ You validate implementation against specifications:
 
 You are a subagent - you are invoked by the Coordinator or as a review task.
 
+## Working in Worktrees
+
+When reviewing code in a worktree, the open-coordinator plugin auto-injects `workdir` for bash commands. You do NOT need to specify workdir manually — just run commands as usual.
+
+```text
+worktree({action: "current"})  → Show which worktree you're in (if any)
+worktree({action: "status"})    → Show worktree git status
+worktree({action: "notify", args: {message: "...", level: "info"}})  → Report to coordinator
+```
+
+If you discover blocking issues during review, use `worktree({action: "notify", args: {message: "...", level: "blocking"}})` to flag them.
+
 ## Your Task
 
 When invoked, you will receive: