fix: queue daemon crashes on every task - 3 bugs

Fix 3 bugs from issue #174 that caused silent failure loop:

1. kugetsu-log.sh: Fix json.loads with newlines
   - Previously, notifications JSON was embedded in a single-quoted Python
     string literal, but newlines in the JSON broke the Python parser.
   - Fix: Pass JSON via stdin to Python instead of embedding in string.

2. kugetsu-queue-daemon.sh: Create logs directory during init
   - The logs/ directory ($LOGS_DIR) was never created during kugetsu init.
   - Fix: Add mkdir -p for LOGS_DIR, WORKTREES_DIR, QUEUE_DIR, and
     QUEUE_ITEMS_DIR to ensure_dirs() and ensure_queue_dirs().

3. kugetsu: Fix parse_issue_ref_from_message URL parsing
   - The function used buggy grep/sed to parse URLs like
     #158
   - Fix: Use bash regex (=~) for reliable URL parsing with proper
     capture groups.

Additional improvements:
   - ensure_dirs() now creates all necessary directories instead of just
     SESSIONS_DIR
   - ensure_queue_dirs() now also creates QUEUE_DIR and LOGS_DIR
   - parse_issue_ref_from_message uses consistent bash regex approach
     for all URL patterns

skills/kugetsu/scripts/kugetsu

@@ -854,11 +854,6 @@ EOF
 }
 
 parse_issue_ref_from_message() {
-    # DEPRECATED: This function is not called anywhere.
-    # The active implementation is extract_issue_ref_from_message()
-    # in kugetsu-session.sh which is used by cmd_delegate.
-    # This function is kept for backwards compatibility and will
-    # be removed in a future release.
     local message="$1"
     
     local gitserver=""

skills/kugetsu/scripts/kugetsu-session.sh

@@ -156,11 +156,13 @@ extract_issue_ref_from_message() {
         return
     fi
     
-    if [[ "$message" =~ (https?://)?([a-zA-Z0-9.-]+)/([a-zA-Z0-9._-]+)/([a-zA-Z0-9._-]+)/(issues|pull)/([0-9]+) ]]; then
-        local instance="${BASH_REMATCH[2]}"
-        local owner="${BASH_REMATCH[3]}"
-        local repo="${BASH_REMATCH[4]}"
-        local num="${BASH_REMATCH[6]}"
+    if [[ "$message" =~ (https?://[a-zA-Z0-9.-]+/[a-zA-Z0-9._-]+/[a-zA-Z0-9._-]+/(issues|pull)/[0-9]+) ]]; then
+        local url="${BASH_REMATCH[1]}"
+        local path=$(echo "$url" | sed 's|https\?://||' | cut -d'/' -f2-)
+        local instance=$(echo "$path" | cut -d'/' -f1)
+        local owner=$(echo "$path" | cut -d'/' -f2)
+        local repo=$(echo "$path" | cut -d'/' -f3)
+        local num=$(echo "$path" | grep -oE '[0-9]+$')
         echo "${instance}/${owner}/${repo}#${num}"
         return
     fi