Add /handoff ritual reminder to status line

adapters/claude/statusline.sh

@@ -53,12 +53,26 @@ if [ -n "$transcript" ] && [ -r "$transcript" ] && command -v jq >/dev/null 2>&1
   fi
 fi
 
+# 5. Handoff-ritual reminder. Green once /handoff has been invoked this session,
+#    red until then — a nudge to run the session-close ritual (update AGENTS.md,
+#    commit, push). Detected from the transcript: the slash-command marker the
+#    harness writes when /handoff is typed, or the Skill-tool form when it is
+#    invoked programmatically. Note this detects invocation, not completion.
+handoff=$(printf '\033[31m/handoff NOT RUN YET\033[0m')
+if [ -n "$transcript" ] && [ -r "$transcript" ] && command -v grep >/dev/null 2>&1; then
+  if grep -qF -e '<command-name>/handoff</command-name>' \
+              -e '"name":"Skill","input":{"skill":"handoff"}' "$transcript" 2>/dev/null; then
+    handoff=$(printf '\033[32m/handoff successfully run\033[0m')
+  fi
+fi
+
 # Assemble the line, separating non-empty segments with " | "
 parts=()
 [ -n "$cwd" ]     && parts+=("$cwd")
 [ -n "$branch" ]  && parts+=("$branch")
 [ -n "$model" ]   && parts+=("$model")
 [ -n "$ctx" ]     && parts+=("$ctx")
+[ -n "$handoff" ] && parts+=("$handoff")
 
 joined=""
 for part in "${parts[@]}"; do