feat(tick): add run_tick_backtest — tick-native simulation engine, bump to 0.4.0

Adds a full tick-level backtest path that operates on raw tick arrays
(ltp, bid, ask, per-tick buy/sell qty deltas, oi) plus caller-computed
entry/exit signal bool arrays. Entry fills at ask+slippage; stop/target
checked against ltp on every tick; max-hold-seconds time exit; cooldown
between entries. Produces identical BacktestMetrics as run_single_backtest
via the new compute_backtest_metrics free fn.

5 Rust unit tests: target-hit, stop-hit, time-exit, multi-trade-with-cooldown,
empty-ticks edge case — all pass (138 total, 0 failed).

Co-Authored-By: porcelaincode <contact@alphabench.in>

python/raptorbt/__init__.py

@@ -26,6 +26,7 @@ from raptorbt._raptorbt import (
     run_pairs_backtest,
     run_multi_backtest,
     run_spread_backtest,
+    run_tick_backtest,
     # Batch backtest
     PyBatchSpreadItem,
     batch_spread_backtest,
@@ -46,7 +47,7 @@ from raptorbt._raptorbt import (
     rolling_max,
 )
 
-__version__ = "0.3.4"
+__version__ = "0.4.0"
 
 __all__ = [
     # Config classes
@@ -65,6 +66,7 @@ __all__ = [
     "run_pairs_backtest",
     "run_multi_backtest",
     "run_spread_backtest",
+    "run_tick_backtest",
     # Batch backtest
     "PyBatchSpreadItem",
     "batch_spread_backtest",