fix(kugetsu): kugetsu-session.sh needs to source required modules

When daemon sources kugetsu-session.sh to call cmd_start/cmd_continue,
it needs access to functions from kugetsu-config.sh, kugetsu-index.sh,
kugetsu-worktree.sh, and kugetsu-log.sh. Add sourcing at top of
kugetsu-session.sh.

skills/kugetsu/scripts/kugetsu-session.sh

@@ -1,6 +1,13 @@
 #!/bin/bash
 set -euo pipefail
 
+# Source required modules for session management functions
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/kugetsu-config.sh"
+source "$SCRIPT_DIR/kugetsu-index.sh"
+source "$SCRIPT_DIR/kugetsu-worktree.sh"
+source "$SCRIPT_DIR/kugetsu-log.sh"
+
 count_active_dev_sessions() {
     local count=0
     if [ -d "$SESSIONS_DIR" ]; then