feat: login-free Stockbit intraday and quote provider

Read Stockbit's public symbol page (__NEXT_DATA__) with a plain ureq
request and an honest user agent: `stocks intraday` (today by the
minute, any provider), `--provider stockbit` quotes with the best
bid/offer only while the market is open, and MCP `get_intraday`.

- UPSTREAMBLOCKED error (exit 4) for a CDN 403; never retried
- requests paced 1 s apart across idx processes, 5 s snapshot cache
- global --provider flag (yahoo, msn, stockbit)
- roadmap: L1 ships from Stockbit; depth stays a login follow-on

README.md

@@ -71,6 +71,7 @@ idx stocks history BBCA --period 3mo
 idx stocks technical BBCA
 idx stocks fundamental BBCA
 idx stocks compare BBCA BBRI BMRI
+idx stocks intraday BBCA          # today by the minute (Stockbit, delayed)
 idx -o json stocks quote BBCA
 
 # Ownership: download the maintained snapshot once, then query locally
@@ -90,8 +91,12 @@ idx ownership changes --from 2026-07-31 --to 2026-08-31
 - Analysis: `technical`, `growth`, `valuation`, `risk`, and a combined
   `fundamental` report; multi-symbol `compare`; MSN stock `screen`
 - Providers: MSN is the default for quotes, fundamentals, and screening;
-  Yahoo serves history. Switch with `IDX_PROVIDER=msn|yahoo` and
+  Yahoo serves history. Switch with `--provider`/`IDX_PROVIDER=msn|yahoo` and
   `IDX_HISTORY_PROVIDER=auto|yahoo|msn`
+- Stockbit, opt-in and 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, for 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
 
 ### Ownership (KSEI shareholders above 1%)
@@ -158,8 +163,8 @@ change it to `auto` with `idx config set general.output auto`.
 
 ## MCP server
 
-`idx-mcp` serves the same data to MCP clients over stdio, as 14 tools:
-`get_quotes`, `get_price_history`, `screen_stocks`, `get_company`,
+`idx-mcp` serves the same data to MCP clients over stdio, as 15 tools:
+`get_quotes`, `get_intraday`, `get_price_history`, `screen_stocks`, `get_company`,
 `analyze_stock`, `compare_stocks`, `get_broker_summary`, `analyze_bandar`,
 `get_foreign_flow`, `get_shareholders`, `get_investor_holdings`,
 `search_investors`, `get_ownership_changes`, and `ownership_status`. Live results come wrapped as