fix(kugetsu): detect session via DB query instead of opencode session list

opencode session list doesn't show sessions in ~/.kugetsu-worktrees/ directories.
This caused detection to fail even though sessions were being created.

Now we query the database directly for sessions matching the worktree path.
Also fixed database path in fix_session_permissions (was ~/.opencode/, should be ~/.local/share/opencode/).

skills/kugetsu/scripts/kugetsu

@@ -876,7 +876,7 @@ cmd_doctor() {
 }
 
 fix_session_permissions() {
-    local opencode_db="${OPENCODE_DB:-$HOME/.opencode/opencode.db}"
+    local opencode_db="${OPENCODE_DB:-$HOME/.local/share/opencode/opencode.db}"
     
     if [ ! -f "$opencode_db" ]; then
         echo "[ERROR] opencode database not found: $opencode_db"
@@ -1226,12 +1226,6 @@ cmd_start() {
 
     local session_file="$(issue_ref_to_filename "$issue_ref").json"
 
-    # Get list of sessions before fork to compare against after
-    declare -a before_sessions=()
-    while IFS= read -r sess; do
-        before_sessions+=("$sess")
-    done < <(opencode session list 2>/dev/null | grep -oP '^ses_\w+')
-
     echo "Forking session for '$issue_ref'..."
     
     # Session-counting: count actual dev sessions, reject if at limit
@@ -1264,25 +1258,17 @@ cmd_start() {
     while [ $attempt -le $max_attempts ]; do
         sleep 1
         
-        while IFS= read -r sess; do
-            [ "$sess" = "$base_session_id" ] && continue
-            [ "$sess" = "$pm_agent_session_id" ] && continue
-            
-            local existed_before=false
-            for before_sess in "${before_sessions[@]}"; do
-                if [ "$sess" = "$before_sess" ]; then
-                    existed_before=true
-                    break
-                fi
-            done
-            
-            if [ "$existed_before" = false ]; then
-                new_session_id="$sess"
-                break
-            fi
-        done < <(opencode session list 2>/dev/null | grep -oP '^ses_\w+')
+        new_session_id=$(python3 -c "
+import sqlite3
+conn = sqlite3.connect('$opencode_db')
+cursor = conn.cursor()
+cursor.execute(\"SELECT id FROM session WHERE directory = '$worktree_path' ORDER BY time_created DESC LIMIT 1\")
+result = cursor.fetchone()
+if result:
+    print(result[0])
+" 2>/dev/null || echo "")
         
-        if [ -n "$new_session_id" ]; then
+        if [ -n "$new_session_id" ] && [ "$new_session_id" != "$base_session_id" ] && [ "$new_session_id" != "$pm_agent_session_id" ]; then
             break
         fi
         
@@ -1295,21 +1281,6 @@ cmd_start() {
     done
 
     if [ -z "$new_session_id" ]; then
-        if [ -f "$opencode_db" ]; then
-            local db_sessions=$(python3 -c "
-import sqlite3
-conn = sqlite3.connect('$opencode_db')
-cursor = conn.cursor()
-cursor.execute(\"SELECT id FROM session WHERE parent_id IS NOT NULL ORDER BY time_created DESC LIMIT 5\")
-for row in cursor.fetchall():
-    print(row[0])
-" 2>/dev/null || echo "")
-            if [ -n "$db_sessions" ]; then
-                echo "Recent forked sessions in DB:" >&2
-                echo "$db_sessions" >&2
-            fi
-        fi
-        
         echo "Error: Could not find newly created session after ${max_attempts}s" >&2
         if [ -n "$fork_log_output" ]; then
             echo "Fork log output:" >&2