docs: document mcp backed rpc server

docs/current_roadmap.md

@@ -158,6 +158,9 @@ implementation state.
       catalog snapshots are not mutated. Config-shadowed add is rejected in v1.
       Remove requires `--confirm` in CLI; local/static servers report
       unavailable.
+   - Completed: `wf-rpc-server --mcp-config wf_mcp.config.json` starts the
+      JSON-RPC transport over an MCP-backed `WorkflowServer`, making the remote
+      CLI path usable with MCP sources and desired source registry operations.
 - Cleanup candidate: consolidate store/source registry id validation patterns
       (`SOURCE_REGISTRY_ID_PATTERN`, `STORE_ID_PATTERN`) only after another package
       needs the same rule. Today they intentionally stay close to their stores.

docs/superpowers/specs/2026-06-03-long-lived-workflow-api-boundary.md

@@ -2,7 +2,7 @@
 
 Date: 2026-06-03
 
-Status: Slices 1-4 implemented. `wf_server` provides
+Status: Slices 1-5 implemented. `wf_server` provides
 `build_local_static_workflow_server`; `wf_mcp.broker.server` can adapt MCP
 broker config/services into the neutral `WorkflowServer`; `wf_transport_rpc_http`
 provides JSON-RPC methods and client support; `wf_cli` has target-aware context;
@@ -109,6 +109,8 @@ Implementation status:
 - Slice 4 complete: `wf_mcp.broker.server.build_workflow_server_from_config()`
   returns a neutral `WorkflowServer` backed by MCP broker runtime services,
   including source registry admin and platform admin surfaces.
+- Slice 5 complete: `wf-rpc-server --mcp-config <path>` starts JSON-RPC over an
+  MCP-backed `WorkflowServer`; `--store-root` remains local/static-only.
 
 First slice should not include:
 

docs/wf_cli.md

@@ -13,6 +13,31 @@ wf --config wf_mcp.config.json <command>
 
 If `--config` is omitted, `wf_mcp.config.json` is used.
 
+## Remote Server
+
+Start a local/static JSON-RPC workflow server:
+
+```bash
+wf-rpc-server --store-root .wf_store --host 127.0.0.1 --port 8765
+```
+
+Start a JSON-RPC server backed by MCP broker config and MCP-capable sources:
+
+```bash
+wf-rpc-server --mcp-config wf_mcp.config.json --host 127.0.0.1 --port 8765
+```
+
+Then point `wf` at it:
+
+```bash
+wf --url http://127.0.0.1:8765/rpc cap list
+wf --url http://127.0.0.1:8765/rpc admin registry list
+```
+
+`--mcp-config` owns the server's workflow stores, MCP connections, and source
+registry. `--store-root` is for the local/static server path and cannot be
+combined with `--mcp-config`.
+
 ## Output Policy
 
 JSON is the default output format for every command.