Addresses two non-blocking review notes on the Hermes Console PR:
- console_engine: the four _*_summaries helpers import a subcommand module
and build a throwaway argparse tree purely to extract help summaries. The
dashboard opens a fresh HermesConsoleEngine per /api/console connection, so
every reconnect re-imported + re-parsed the whole CLI surface. The surface
is process-static, so memoize with functools.lru_cache — callers only read
the returned map.
- web_server: console commands run in a worker thread via asyncio.to_thread.
On a 60s timeout asyncio.wait_for cancels the awaitable, but Python threads
aren't preemptible, so a stuck worker keeps running and would leak into the
shared default thread pool. Route console execution through a small
dedicated bounded ThreadPoolExecutor (max_workers=4) so a leaked worker is
capped and concurrent console execution is bounded regardless of reconnects.
Follow-up on top of @shannonsands' NS-574 Hermes Console.
