fix(self-terminate): traverse process tree to find Claude

The script now walks up the process tree instead of only checking
the immediate parent. This handles cases where there are intermediate
shells between the spawned command and the Claude process.

Co-Authored-By: Claude Code (~/.ai.worktrees/subagent-via-tmux) <noreply@anthropic.com>

Author: nsheaps

plugins/self-terminate/bin/self-terminate.sh

@@ -4,16 +4,49 @@
 
 set -euo pipefail
 
-# Get the parent PID (Claude process)
-CLAUDE_PID="$PPID"
+# Traverse up the process tree to find Claude
+find_claude_pid() {
+    local pid="$PPID"
+    local max_depth=10
+    local depth=0
 
-# Verify it's actually a claude process
-PROCESS_NAME=$(ps -o comm= -p "$CLAUDE_PID" 2>/dev/null || echo "unknown")
+    while [[ $depth -lt $max_depth ]]; do
+        local process_name
+        process_name=$(ps -o comm= -p "$pid" 2>/dev/null || echo "")
 
-if [[ "$PROCESS_NAME" != *"claude"* ]]; then
-    echo "Error: Parent process ($CLAUDE_PID) is not Claude (found: $PROCESS_NAME)" >&2
+        if [[ -z "$process_name" ]]; then
+            echo "Error: Could not find Claude in process tree (reached PID $pid)" >&2
+            return 1
+        fi
+
+        if [[ "$process_name" == *"claude"* ]]; then
+            echo "$pid"
+            return 0
+        fi
+
+        # Get parent of current pid
+        local parent_pid
+        parent_pid=$(ps -o ppid= -p "$pid" 2>/dev/null | tr -d ' ')
+
+        if [[ -z "$parent_pid" || "$parent_pid" == "0" || "$parent_pid" == "1" ]]; then
+            echo "Error: Reached init without finding Claude" >&2
+            return 1
+        fi
+
+        pid="$parent_pid"
+        ((depth++))
+    done
+
+    echo "Error: Max depth reached without finding Claude" >&2
+    return 1
+}
+
+CLAUDE_PID=$(find_claude_pid)
+
+if [[ -z "$CLAUDE_PID" ]]; then
     exit 1
 fi
 
-echo "Sending SIGINT to Claude process (PID: $CLAUDE_PID)..."
+echo "Found Claude process (PID: $CLAUDE_PID)"
+echo "Sending SIGINT..."
 kill -INT "$CLAUDE_PID"