fix(stockbit): bid/offer while trading; drop stale foreign flow

Observed in session on 2026-11-03:

- The regular board trades as STATE_NAME_SESSION_2, not the assumed
  STATE_NAME_MARKET_OPEN, so session quotes hid bid/offer all day. Any
  numbered STATE_NAME_SESSION_<n> now counts as trading; the lunch break
  is STATE_NAME_BREAK.
- In session the order book's fbuy/fsell/fnet were the previous session's
  (equal to IPOT's 2026-11-02 net for BBCA, BBRI and TLKM) and
  has_foreign_bs was false. Foreign figures are kept only when that flag
  is true.

Fixtures for the break, the trading state and an in-session book; the
table names the session ("market open (session 2)").

Claude-Session: https://claude.ai/code/session_01RqPPVeVDrnLoP7NUZmLRxY

README.md

@@ -96,7 +96,7 @@ idx ownership changes --from 2026-07-31 --to 2026-08-31
 - Stockbit, opt-in: without a login, `stocks intraday` (today's price by the
   minute) and `--provider stockbit` quotes with the best bid/offer while the
   market is open, delayed at least 10 minutes. With your own account
-  (`idx stockbit login`): `stocks orderbook` depth and foreign flow, live
+  (`idx stockbit login`): `stocks orderbook` depth, live
   quotes and Stockbit daily history. Personal use under Stockbit's terms; see
   the [Stockbit page](https://idx.rasyidanaf.com/cli/stockbit/)
 - Local file cache with TTL, and `--offline` mode with stale-cache fallback