fix: portal stability, session list DB fallback, and UX polish

- Free stale Memind listeners on 8081 before startup and exit cleanly on EADDRINUSE
- Backfill owned sessions missing from Goose via h5_conversation_messages summaries
- Strip Memind task orchestration prefixes from user-facing chat text
- Repair missing public docx links before release MindSpace link checks

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/run-memind-portal-prod.sh

@@ -26,4 +26,31 @@ fi
 export GOOSED_MCP_NODE_PATH="${GOOSED_MCP_NODE_PATH:-${NODE_BIN}}"
 export GOOSED_MCP_SERVER_PATH="${GOOSED_MCP_SERVER_PATH:-${ROOT}/mindspace-sandbox-mcp.mjs}"
 
+free_port_if_stale_memind_listener() {
+  local port="${H5_PORT:-8081}"
+  local pids
+  pids="$(lsof -tiTCP:"${port}" -sTCP:LISTEN 2>/dev/null || true)"
+  [[ -z "${pids}" ]] && return 0
+
+  while read -r pid; do
+    [[ -z "${pid}" ]] && continue
+    local args
+    args="$(ps -p "${pid}" -o args= 2>/dev/null || true)"
+    if [[ "${args}" == *"${ROOT}/server.mjs"* ]]; then
+      echo "[portal-start] stopping stale Memind listener pid=${pid}" >&2
+      kill "${pid}" 2>/dev/null || true
+      sleep 1
+      if kill -0 "${pid}" 2>/dev/null; then
+        kill -9 "${pid}" 2>/dev/null || true
+        sleep 1
+      fi
+      continue
+    fi
+    echo "[portal-start] port ${port} held by foreign pid=${pid}; refusing to start" >&2
+    exit 1
+  done <<< "${pids}"
+}
+
+free_port_if_stale_memind_listener
+
 exec "${NODE_BIN}" "${ROOT}/server.mjs"