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Replace outdated worktree_make/worktree_mode/worktree_overview/worktree_cleanup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.

AGENTS.md

@@ -1,4 +1,4 @@
-## Memory Tools
+## Memory Tools (via @alkdev/open-memory plugin)
 
 You have access to two tools for managing your context and accessing session history:
 
@@ -8,7 +8,11 @@ Read-only tool for introspecting your session history and context state. Availab
 - `memory({tool: "help"})` — full reference with examples
 - `memory({tool: "summary"})` — quick counts of projects, sessions, messages, todos
 - `memory({tool: "sessions"})` — list recent sessions (useful for finding past work)
+- `memory({tool: "children", args: {sessionId: "ses_..."}})` — list sub-agent sessions spawned from a parent
 - `memory({tool: "messages", args: {sessionId: "..."}})` — read a session's conversation
+- `memory({tool: "messages", args: {sessionId: "...", role: "assistant"}})` — read only assistant messages
+- `memory({tool: "messages", args: {sessionId: "...", showTools: true}})` — include tool-call output
+- `memory({tool: "message", args: {messageId: "msg_..."}})` — read a single message by ID
 - `memory({tool: "search", args: {query: "..."}})` — search across all conversations
 - `memory({tool: "compactions", args: {sessionId: "..."}})` — view compaction checkpoints
 - `memory({tool: "context"})` — check your current context window usage
@@ -30,3 +34,26 @@ Trigger compaction on the current session. This summarizes the conversation so f
 - When the task is nearly complete (just finish the task instead)
 
 Compaction preserves your most important context in a structured summary — you will continue the session with the summary as your starting point.
+
+## Worktree Tool (via @alkimiadev/open-coordinator plugin)
+
+You have access to the `worktree` tool for git worktree management and session coordination. Call with `{action, args}`:
+
+### Coordinator Operations (available when session is not spawned by another session)
+
+- `worktree({action: "list"})` — List git worktrees
+- `worktree({action: "dashboard"})` — Worktree dashboard with session info
+- `worktree({action: "spawn", args: {tasks: [...], prompt: "..."}})` — Spawn parallel worktrees + sessions
+- `worktree({action: "sessions"})` — Query spawned session status
+- `worktree({action: "message", args: {sessionID: "...", message: "..."}})` — Message a session
+- `worktree({action: "abort", args: {sessionID: "..."}})` — Abort a session
+- `worktree({action: "cleanup", args: {action: "remove", pathOrBranch: "..."}})` — Remove worktree
+- `worktree({action: "help"})` — Show all available operations
+
+### Implementation Operations (available when session is spawned by a coordinator)
+
+- `worktree({action: "current"})` — Show your worktree mapping
+- `worktree({action: "notify", args: {message: "...", level: "info|blocking"}})` — Report to coordinator
+- `worktree({action: "status"})` — Show worktree git status
+
+The plugin auto-injects `workdir` for bash commands when the session is mapped to a worktree.