session symbols round 7: HTF completion/warm-up on the symbol clock, prearmed brackets at the fill open, syminfo.type, 24h session strings, trail_offset ticks, Qty export

[luisleo526]

Round 7 of the session-symbol parity campaign (NASDAQ:AAPL / OANDA:EURUSD lanes; BINANCE:ETHUSDT.P 24×7 stays bit-identical apart from three TV-faithful moves noted below). Seven generic fixes, each measured in isolation and as a composition (lab findings 458–465):

1. HTF buckets complete on the period's last chart bar (src/timeframe.cpp, finding 458): the last intraday request.security bucket of an RTH day ('240'/'60'/'45') completes at the session close; equity W/M complete on the period's last traded session bar (Fri + 24 h is Saturday, not next week); forex W/M complete on Friday 16:45 ET of the wrapped 1700–1700 session. raphaeltay-dual-cof-4h-45m (AAPL) 22.4 % → 100 %; the weekly EURUSD probe → 100 %.
2. request.security warm-up sees only HTF buckets whose open is inside the loaded range (finding 465): a straddling first bucket is absent, not a partial bar 1. heneralmomo25 (EURUSD) weak → excellent; mayur-das4 weak → strong; masayanfx → excellent.
3. Prearmed brackets breached by the parent's fill open scratch at that open (finding 464): dual-marketable stop/limit legs and trail-carrying legs, plus a re-issued ticks bracket on an intrabar-filled limit parent resolving on its fill bar. bprakaash 269/269; stevenygabbyperez count delta 31 → 1.
4. syminfo.type is settable (strategy_set_syminfo_type / set_syminfo_string, runtime_overrides.type; finding 462): forex pip auto-detection no longer runs on the "crypto" default.
5. A session string with start == end is a 24-hour session (finding 461): time/time_close/session filters on '1700-1700' returned na, so every minute(time_close) gate on the forex lane was dead. vasudevshenoy 152 → 439/451.
6. Fractional trail_offset truncates to whole ticks (finding 463): TV uses floor (58/62 EURUSD, 11/11 on the ETH nils orb strategy); trail_points keeps its evidence-backed ceil.
7. engine_trades.csv prints Qty at lot precision (finding 460): the %g export truncated to 6 significant digits (92293.36 → 92293.4, ≥1e6 → 1e+06).

ETH population: 396/396 unchanged, corpus 309/2/1 (promote). Three ETH tapes change bytes without any tier move: bprakaash (368 → 371/371 — TV's own duration-0 rows), nils123456-orb-strat (11 trail exits move to TV's tick), alpha-wizard-wave (Qty column text). ctest 141/141.