fix(hooks): remove stale STATE.md from notify hook

STATE.md reflects project state, not session state. It persists across
sessions and shows misleading info like "Phase complete" from previous
work. Now only uses session-scoped todo list.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

hooks/gsd-notify.sh

@@ -13,19 +13,9 @@ if [[ -n "$cwd" ]]; then
   project=$(basename "$cwd")
 fi
 
-# Try to get context from GSD state file
+# Check todo list for current/completed task
 message=""
-state_file="$cwd/.planning/STATE.md"
-if [[ -f "$state_file" ]]; then
-  phase=$(grep -m1 "^Phase:" "$state_file" 2>/dev/null | sed 's/^Phase: *//')
-  status=$(grep -m1 "^Status:" "$state_file" 2>/dev/null | sed 's/^Status: *//')
-  if [[ -n "$phase" && -n "$status" ]]; then
-    message="Phase $phase: $status"
-  fi
-fi
-
-# Fallback: check todo list for current/completed task
-if [[ -z "$message" && -n "$session_id" ]]; then
+if [[ -n "$session_id" ]]; then
   todo_file=$(ls -t "$HOME/.claude/todos/${session_id}"*.json 2>/dev/null | head -1)
   if [[ -f "$todo_file" ]]; then
     # Get most recently completed task, or in-progress task