fix: reap MCP runtimes on config reload

docs/gateway/configuration-reference.md

@@ -85,6 +85,9 @@ target server during config edits.
 - `mcp.sessionIdleTtlMs`: idle TTL for session-scoped bundled MCP runtimes.
   One-shot embedded runs request run-end cleanup; this TTL is the backstop for
   long-lived sessions and future callers.
+- Changes under `mcp.*` hot-apply by disposing cached session MCP runtimes.
+  The next tool discovery/use recreates them from the new config, so removed
+  `mcp.servers` entries are reaped immediately instead of waiting for idle TTL.
 
 See [MCP](/cli/mcp#openclaw-as-an-mcp-client-registry) and
 [CLI backends](/gateway/cli-backends#bundle-mcp-overlays) for runtime behavior.

docs/gateway/configuration.md

@@ -545,7 +545,7 @@ Most fields hot-apply without downtime. In `hybrid` mode, restart-required chang
 | Agent & models      | `agent`, `agents`, `models`, `routing`                            | No              |
 | Automation          | `hooks`, `cron`, `agent.heartbeat`                                | No              |
 | Sessions & messages | `session`, `messages`                                             | No              |
-| Tools & media       | `tools`, `browser`, `skills`, `audio`, `talk`                     | No              |
+| Tools & media       | `tools`, `browser`, `skills`, `mcp`, `audio`, `talk`              | No              |
 | UI & misc           | `ui`, `logging`, `identity`, `bindings`                           | No              |
 | Gateway server      | `gateway.*` (port, bind, auth, tailscale, TLS, HTTP)              | **Yes**         |
 | Infrastructure      | `discovery`, `canvasHost`, `plugins`                              | **Yes**         |