fix: remove unnecessary rm of msg file to avoid race condition

skills/kugetsu/scripts/kugetsu-session.sh

@@ -286,9 +286,7 @@ Workflow:
 6. If anything is unclear, post a comment on the issue asking for clarification before implementing
 7. Implement the solution
 8. Create a branch named fix/issue-$number and implement the fix
-9. Create a PR when the implementation is complete using: tea pr create --repo $owner/$repo --title \"Your PR title\" --body \"PR description\"
+9. Create a PR when the implementation is complete
-   - Make sure you are logged in with: tea login add --name gitea --token \$GITEA_TOKEN --url https://$instance
-   - If tea is not available, use: curl -X POST \"https://$instance/api/v1/repos/$owner/$repo/pulls\" -H \"Authorization: Bearer \$GITEA_TOKEN\" -H \"Content-Type: application/json\" -d '{\"title\":\"PR Title\",\"head\":\"branch-name\",\"base\":\"main\",\"body\":\"PR description\"}'
 
 Work directory: $worktree_path"
     
@@ -381,11 +379,7 @@ cmd_start() {
     
     cd "$worktree_path"
     local sanitized_id=$(echo "$new_session_id" | sed 's/[^a-zA-Z0-9_-]/_/g')
-    mkdir -p "$worktree_path/.kugetsu"
+    local msg_file="$worktree_path/.kugetsu-msg.txt"
-    if [ ! -f "$worktree_path/.gitignore" ] || ! grep -q "^.kugetsu/" "$worktree_path/.gitignore"; then
-        echo ".kugetsu/" >> "$worktree_path/.gitignore" 2>/dev/null || true
-    fi
-    local msg_file="$worktree_path/.kugetsu/msg.txt"
     printf '%s' "$dev_message" > "$msg_file"
     nohup sh -c "GITEA_TOKEN='${GITEA_TOKEN:-}' opencode run '@$msg_file' --session '$new_session_id'" >> "$LOGS_DIR/dev-$sanitized_id.log" 2>&1 &
     
@@ -451,11 +445,7 @@ cmd_continue() {
     
     cd "$worktree_path"
     local sanitized_id=$(echo "$opencode_session_id" | sed 's/[^a-zA-Z0-9_-]/_/g')
-    mkdir -p "$worktree_path/.kugetsu"
+    local msg_file="$worktree_path/.kugetsu-msg.txt"
-    if [ ! -f "$worktree_path/.gitignore" ] || ! grep -q "^.kugetsu/" "$worktree_path/.gitignore"; then
-        echo ".kugetsu/" >> "$worktree_path/.gitignore" 2>/dev/null || true
-    fi
-    local msg_file="$worktree_path/.kugetsu/msg.txt"
     printf '%s' "$message" > "$msg_file"
     nohup sh -c "GITEA_TOKEN='${GITEA_TOKEN:-}' opencode run '@$msg_file' --session '$opencode_session_id'" >> "$LOGS_DIR/dev-$sanitized_id.log" 2>&1 &
 }