docs: fix CLI command tree, SDK import path, and tool group listing

- Remove non-existent 'secrets migrate' from CLI command tree
- Add actual secrets subcommands: audit, configure, apply
- Add missing plugin subcommands: inspect, uninstall, update, marketplace list
- Fix plugins info -> inspect (actual command name)
- Add message send and broadcast subcommands to command tree
- Remove misleading deprecated import from sdk-overview
- Add sessions_yield and subagents to group:sessions tool group docs
- Fix formatting

docs/cli/index.md

@@ -113,7 +113,9 @@ openclaw [--dev] [--profile <name>] <command>
     audit
   secrets
     reload
-    migrate
+    audit
+    configure
+    apply
   reset
   uninstall
   update
@@ -132,16 +134,21 @@ openclaw [--dev] [--profile <name>] <command>
     check
   plugins
     list
-    info
+    inspect
     install
+    uninstall
+    update
     enable
     disable
     doctor
+    marketplace list
   memory
     status
     index
     search
   message
+    send
+    broadcast
   agent
   agents
     list