feat(kugetsu): implement fire-and-forget delegation

- cmd_delegate now runs in background with nohup + disown
- Output logged to ~/.kugetsu/logs/delegate-<timestamp>.log
- Added cmd_logs to view recent delegation logs
- Log rotation: logs older than 7 days auto-deleted

Issue #41: #41

skills/kugetsu/scripts/kugetsu

@@ -7,6 +7,7 @@ WORKTREES_DIR="$KUGETSU_DIR/worktrees"
 REPOS_CONFIG="$KUGETSU_DIR/repos.json"
 INDEX_FILE="$KUGETSU_DIR/index.json"
 NOTIFICATIONS_FILE="$KUGETSU_DIR/notifications.json"
+LOGS_DIR="$KUGETSU_DIR/logs"
 
 usage() {
     cat << 'EOF'
@@ -16,7 +17,8 @@ Usage:
     kugetsu init [--force]                            Initialize base + pm-agent sessions (requires TTY)
     kugetsu start <issue-ref> <message> [--debug]    Start task for issue (forks base session)
     kugetsu continue <issue-ref> [message] [--debug] Continue existing task for issue
-    kugetsu delegate <message>                        Send message to PM agent
+    kugetsu delegate <message>                        Send message to PM agent (fire-and-forget)
+    kugetsu logs [n]                                  Show recent delegation logs (default: 10)
     kugetsu status                                    Check kugetsu initialization status
     kugetsu doctor [--fix]                            Diagnose and fix kugetsu issues
     kugetsu notify [list|clear]                        Show or clear notifications
@@ -38,7 +40,10 @@ Commands:
                 Requires pm-agent to be running (created by init).
     continue    Continue work on existing issue session.
     delegate    Send message to PM agent for task coordination.
-                PM context is loaded once at init time.
+                Fire-and-forget: returns immediately, runs in background.
+                Use 'kugetsu logs' to check output.
+    logs        Show recent delegation logs.
+                Default: 10 most recent. Use 'kugetsu logs 20' for more.
     status      Check if kugetsu is initialized and PM agent is active.
     doctor      Diagnose kugetsu issues. Use --fix to attempt repairs.
     notify      Show or clear notifications from PM agent.
@@ -64,6 +69,8 @@ Examples:
     kugetsu init
     kugetsu status
     kugetsu delegate "work on issue #5"
+    kugetsu logs
+    kugetsu logs 20
     kugetsu doctor
     kugetsu doctor --fix
     kugetsu notify list
@@ -493,7 +500,27 @@ cmd_delegate() {
         exit 1
     fi
     
-    opencode run --continue --session "$pm_session" "$message" 2>&1
+    mkdir -p "$LOGS_DIR"
+    local log_file="$LOGS_DIR/delegate-$(date +%s).log"
+    nohup opencode run --continue --session "$pm_session" "$message" > "$log_file" 2>&1 &
+    disown
+    echo "Delegated to PM agent (logged to $(basename "$log_file"))"
+}
+
+cmd_logs() {
+    local count="${1:-10}"
+    
+    if [ ! -d "$LOGS_DIR" ]; then
+        echo "No logs found."
+        return
+    fi
+    
+    # Log rotation: delete logs older than 7 days
+    find "$LOGS_DIR" -type f -mtime +7 -delete 2>/dev/null
+    
+    ls -lt "$LOGS_DIR" | head -$((count + 1)) | tail -$count | while read line; do
+        echo "$line"
+    done
 }
 
 cmd_doctor() {
@@ -1092,6 +1119,10 @@ main() {
         delegate)
             cmd_delegate "$@"
             ;;
+        logs)
+            shift
+            cmd_logs "$@"
+            ;;
         status)
             cmd_status
             ;;