STATE-WP-0069: MCP Phase 1 deprecation + open_workplans summary alias

Complete MCP legacy deprecation coverage (resource + docstrings + TOOLS.md).
Dual-write open_workplans on /state/summary alongside open_workstreams;
get_domain_summary prefers the new key. T06 internal rename started.

mcp_server/server.py

@@ -334,10 +334,10 @@ def get_domain_summary(domain_slug: str) -> str:
     topic_id = topic["id"]
 
     state_summary = _get("/state/summary")
-    workstreams = [
-        ws for ws in state_summary.get("open_workstreams", [])
-        if ws.get("topic_id") == topic_id
-    ]
+    open_workplans = state_summary.get("open_workplans") or state_summary.get(
+        "open_workstreams", []
+    )
+    workstreams = [ws for ws in open_workplans if ws.get("topic_id") == topic_id]
     blocking = _get("/decisions", {"decision_type": "pending", "topic_id": topic_id})
     recent = _get("/progress", {"topic_id": topic_id, "limit": 5})
     repos = _get("/repos", {"domain": domain_slug})
@@ -467,7 +467,7 @@ def get_domain_summary(domain_slug: str) -> str:
 
 @mcp.tool()
 def get_topic(slug: str) -> str:
-    """Return a topic (with workstreams) by slug, plus its recent progress events."""
+    """Return a topic (with workplans) by slug, plus its recent progress events."""
     topics = _get("/topics")
     match = next((t for t in topics if t["slug"] == slug), None)
     if not match:
@@ -1304,10 +1304,10 @@ def get_next_steps() -> str:
     """Surface contextual next-action suggestions derived from hub state.
 
     Returns suggestions based on:
-    - Recently resolved decisions → first open task in the same workstream
-    - Workstreams whose every dependency is now finished -> first todo task
+    - Recently resolved decisions → first open task in the same workplan
+    - Workplans whose every dependency is now finished -> first todo task
 
-    Each suggestion includes domain, workstream, task, and a plain-language
+    Each suggestion includes domain, workplan, task, and a plain-language
     message. The hub surfaces *what* and *where* — the domain owns *how*.
 
     Derived next steps may include open demand-weighted suggestions from the
@@ -2525,13 +2525,13 @@ def update_repo_goal(
 
 @mcp.tool()
 def get_repo_dispatch(repo_slug: str) -> str:
-    """Return active workstreams, pending tasks, and goal for a repo.
+    """Return active workplans, pending tasks, and goal for a repo.
 
     Use this at the start of a repo agent session to discover what work is
     pending without needing to read the full state summary or scan workplan
     files. The response includes:
       - active_goal: the highest-priority active repo goal
-      - active_workstreams: list of active workstreams with pending tasks
+      - active_workplans: list of active workplans with pending tasks
       - human_interventions: tasks that need human input (needs_human=true)
       - last_state_synced_at: when the repo was last synced to the hub