Add Kimi Code and Deep Code to the default agent roster

kimi installs through its official script rather than mise;
deepcode rides the existing mise path as npm:@vegamo/deepcode-cli.
Both gain launch branches and Default Agent menu entries, plus an
AI Hub entry for provider combos (Kimi/DeepSeek/Z.AI/MiniMax over
Claude Code) via the omarchycn setup wizard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QKxGW1raAWaqeU8WdHsMsp

bin/omarchy-agent

@@ -99,6 +99,14 @@ pi)
   command=(pi)
   [[ -n ${prompt:-} ]] && command+=("$prompt")
   ;;
+kimi)
+  command=(kimi)
+  [[ -n ${prompt:-} ]] && command+=("$prompt")
+  ;;
+deepcode)
+  command=(deepcode)
+  [[ -n ${prompt:-} ]] && command+=("$prompt")
+  ;;
 *)
   echo "Unsupported default agent: $agent" >&2
   exit 1