Add DSH to the agent roster and Install > AI

Official npm @deepseek-ai/dsh (bin: dsh) rides the mise path like Dim.
dsh has no TUI, so the interactive launch is the documented 'dsh web'
and one-shot prompts use 'dsh --profile headless'. Auth is dsh-managed,
so it stays out of the AI Hub registry.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019hLK3wsDuKVAC37GgDqg6H

bin/omarchy-agent

@@ -115,6 +115,14 @@ dim)
     command=(dim)
   fi
   ;;
+dsh)
+  # dsh has no TUI: `dsh web` is the interactive form, headless the one-shot
+  if [[ -n ${prompt:-} ]]; then
+    command=(dsh --profile headless "$prompt")
+  else
+    command=(dsh web)
+  fi
+  ;;
 *)
   echo "Unsupported default agent: $agent" >&2
   exit 1

bin/omarchy-default-agent

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # omarchy:summary=Set and launch the default coding agent
-# omarchy:args=[pi|omp|opencode|ori|claude|codex|grok|agy|copilot|crush|kimi|deepcode|dim]
+# omarchy:args=[pi|omp|opencode|ori|claude|codex|grok|agy|copilot|crush|kimi|deepcode|dim|dsh]
 # omarchy:examples=omarchy default agent | omarchy default agent codex | omarchy default agent kimi
 
 installing=false
@@ -37,8 +37,9 @@ copilot | github-copilot) agent="copilot"; name="GitHub Copilot" ;;
 kimi | kimi-code) agent="kimi"; name="Kimi Code" ;;
 deepcode | deep-code) agent="deepcode"; name="Deep Code"; agent_package="npm:@vegamo/deepcode-cli" ;;
 dim | dimcode | dim-agent) agent="dim"; name="Dim Agent"; agent_package="npm:dimcode" ;;
+dsh | deepseek-harness) agent="dsh"; name="DSH"; agent_package="npm:@deepseek-ai/dsh" ;;
 *)
-  echo "Usage: omarchy-default-agent <pi|omp|opencode|ori|claude|codex|grok|agy|copilot|crush|kimi|deepcode|dim>"
+  echo "Usage: omarchy-default-agent <pi|omp|opencode|ori|claude|codex|grok|agy|copilot|crush|kimi|deepcode|dim|dsh>"
   exit 1
   ;;
 esac