Parity probe 05 - small equity fraction

// This Pine Script® code is licensed under Apache-2.0
// SPDX-License-Identifier: Apache-2.0
// © PineForge contributors 2026
//
// Parity probe 05 — explicit qty at small fraction of equity (no margin pressure)
//
// Purpose: parity-probe-03 has qty = strategy.equity / close (≈100% of
// equity per trade), which puts every entry RIGHT at the 1× margin
// boundary; tiny slippage between signal-bar close and fill-bar open
// then flips margin OK ↔ FAIL. parity-probe-04 routes the same intent
// through TV's auto-sizing path. THIS probe takes the explicit-qty
// path BUT sizes at 10% of equity, so the margin check is satisfied
// by an order of magnitude. Engine and TV should agree on EVERY
// Monday entry — count_delta = 0%, PnL p90 = 0%. Any divergence here
// is therefore NOT margin-related: it's some other rule (pyramiding,
// position-size cap, broker-emulator gating, etc.) that the rest of
// the parity probes have not yet isolated.
//
// Same trigger / exit shape as parity-probe-03 so the only difference
// under test is the qty's relationship to available equity.
//
// TV setup: 15m chart on BINANCE:ETHUSDT.P, same window as
// data/ohlcv_ETH-USDT-USDT_15m.csv. Export "List of Trades" to
// ``tv_trades.csv`` in this folder.
//@version=6
strategy("Parity probe 05 - small equity fraction", shorttitle="par_p05", overlay=true, initial_capital=1000000, commission_type=strategy.commission.percent, commission_value=0, slippage=0, default_qty_type=strategy.fixed, default_qty_value=1, pyramiding=0, process_orders_on_close=false)

// ---- engine -------------------------------------------------------
// Wall-clock entry trigger: 00:00 UTC every Monday.
bool fire = dayofweek == 2 and hour == 0 and minute == 0 and strategy.position_size == 0

// qty encodes 10% of strategy.equity / close — well under the 1×
// margin boundary at all times. Round to 3 decimals so the exported
// CSV is bit-stable across re-runs.
float qty_dyn = math.round(strategy.equity / close * 100) / 1000

if fire and qty_dyn > 0
    strategy.entry("E", strategy.long, qty=qty_dyn, comment="qty = 10% equity / close")

// Exit at next bar's open so each entry maps to a single trade row
// whose Size (qty) reveals 10 × strategy.equity at the entry bar
// (because the divisor is 100, but the rounding is /1000).
if strategy.position_size > 0 and bar_index > strategy.opentrades.entry_bar_index(0)
    strategy.close("E", comment="next-bar flatten")