Replace outdated worktree_make/worktree_mode/worktree_overview/worktree_cleanup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.
