feat(newos4): hermes command, auto-poll, chat_hermes tool, token reset (v4.6.73)

Phase C as repo edits (browser edits in _mods/ do not survive a reload).

- `hermes <msg>`: sends through the chat endpoint and always prints an outcome —
  '📨 Sending…' then either '✅ sent id=… epoch=…' or a coded error with a hint
  (429 retry later, 503 host busy, 401 run hermes-reset). `feedback` stays as the alias.
- NOT named `chat`: ChatStudioModule already registers `chat` and dispatch walks modules
  in order, so a second `chat` was silently unreachable. Found by test, not by reading.
- `hermes-poll` / `feedback-inbox`, `hermes-reset` (token rotation).
- Poller: 30 s, paused while the tab is hidden, polls on visibilitychange, first poll
  adopts the cursor and prints nothing, cursor persisted in webx11_chat_state.
- `chat_hermes` tool: send + read from inside the agent loop.
- Contract/help updated for the rename.

Acceptance: 'hermes acceptance test' in the browser, reply written host-side with
scripts/chat.py, appeared in the terminal by itself 30 s later with no command typed
(cursor 1792776973800).

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