session symbols: syminfo-tz session windows, symbol-clock D/W/M anchors, zero-lot orders, margin call at the open - #162

TradingView keys time("<intraday tf>") / time_close on the symbol's
DAY-STAMP-anchored HTF grid -- the grid 88cd0c8 gave request.security's
ratio buckets -- on every session symbol, and on the epoch grid only
where the stamp is 00:00 UTC; time("D") on OANDA's 1800-1700 session
is the 17:00 ET stamp the D bar opens on, not the 18:00 ET session
open, and time_close("D") the next stamp.

Pinned with `lab tv` (pin-time-hours: strategy.entry(qty =
hour(time(tf), "America/New_York") * 100 + minute(...) + 10000 /
20000 / 30000 for "D" / "240" / "60"), 15m charts, 2025-04-01..07-01):
  OANDA:XAUUSD 1800-1700 ET: "D" = 17:00 on 147/147 entries (the
    engine reported 18:00); "240" in {01:00, 05:00, 09:00, 13:00,
    17:00, 21:00}; "60" every hour on the hour except 17:00;
  NYSE:F 0930-1600 ET: "D" = 09:30; "60" in {09:30, 10:30, .., 15:30}
    -- session-anchored, not the epoch hour the engine reported;
    "240" in {09:30, 13:30};
  NSE:NIFTY 0915-1530 IST: "D" = 23:45 NY (09:15 IST); "240" in
    {23:45, 03:45} NY (09:15 / 13:15 IST);
  BINANCE:BTCUSDT 24x7 UTC: "D" = 20:00 NY (00:00 UTC), epoch grid.
CME_MINI:ES1! exported 0 rows: its request.security "240" grid (17:00
CT anchored) is pinned unchanged and time("240") reads it.

One grid, one place: session_intraday_bucket_open_ms (timeframe.cpp)
is the RATIO bucket of TimeframeAggregator::bucket_open_ms and the
intraday path of compute_tf_open_ms (session_time.cpp), which now
takes the symbol's tz/session from the seven-argument pine_time /
pine_time_close forms; the five-argument forms pass UTC / "" and stay
on the epoch grid bit-for-bit. session_period_open_ms opens the D/W/M
bar on its first session-day's stamp (session_day_stamp_real_ms) and
W/M close on the next period's stamp; the DAY close (open + length =
the next stamp) and session_day_open_real_ms -- the trading open that
session_covered_instant_ms and the close arithmetic use -- are
unchanged. The aux daily-bar router keys both sides through
session_period_open_ms, so its keys move together; the range-start
bucket cut now keys the 1800-1700 D bucket on the stamp, which is
where TradingView's D bar opens. Every session whose open is its
stamp (OANDA 1700-1700, CME 1700-1600 CT, NYSE, NSE, 24x7) is
bit-identical for D/W/M; their intraday time(tf) moves from the epoch
grid to the session grid, as the tapes read.

Re-pins, disclosed:
  - tests/test_session_day_anchors "Intraday tfs keep the epoch grid"
    arrived with b1449c3 (factorial: engine-symbol-r5, pineforge-4pass#162) as a
    design statement with no tape behind it; its "60" check on
    OANDA:EURUSD 1700-1700 never told the grids apart (17:00 ET is on
    the hour) and still holds; "240" is now pinned to the 17:00-ET
    grid.
  - tests/test_session_day_anchors "CME-style 1800-1700" (b1449c3, a
    session-length parser edge case written in the New York zone) is
    OANDA's metals session: its D / W open re-pinned to the stamp, the
    close unchanged. A real CME session (1700-1600 Chicago) is pinned
    with open == stamp.
  - tests/test_oanda_day_stamp_grid rule D (88cd0c8's design pin: the
    1800-1700 D/W/M open and D label at the 18:00 session open) now
    reads the 17:00 stamp; the W/M open follows the D bar (the same
    relation 1700-1700 has) -- extrapolated, no W/M tape.

tests/test_pine_time_day_stamp_grid pins the four tapes and the CME
regression grid (92 checks). ctest 154/154 (153 + the new binary;
test_oanda_day_stamp_grid 692, test_session_day_anchors 23853);
scripts unittest 102 OK; check_c_abi_runtime.py clean. Against the
previous library 53 / 18 / 4 of those checks fail respectively.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Dwbd239WT9zfcTLYM5UpUU