Fix relative exits after non-gap limit parent fills

[luisleo526]

Summary

• resume a single pre-armed relative strategy.exit after its non-gap LIMIT parent fills
• begin child evaluation at the parent actual OHLC-path trigger coordinate
• preserve existing gap, multi-child, multi-parent, COOF, and magnifier behavior

Root cause

A flat-born relative exit has no concrete stop or target until its parent fills. It was classified as phase 0, scanned before a non-gap LIMIT parent, skipped while flat, and never revisited after its prices materialized.

Scope

The ordering adjustment applies only when:

• broker state is flat
• the parent is a prior-bar, flat-born pure LIMIT entry
• the parent does not fill at the bar open
• exactly one relative child is attached to that parent
• parent and child were co-armed in source order
• the child has no absolute or trailing legs
• COOF and bar magnifier are disabled

The child joins the parent existing phase rather than a new global phase, preserving P1 / C1 / P2 / C2 source ordering.

Validation

• new relative-LIMIT contract: 58/58
• existing stop-parent cursor: 28/28
• existing MARKET-gap contract: 85/85
• full CTest suite: 106/106
• git diff --check: clean

The regression matrix distinguishes accepted base, rejected broad scheduling, and the final fenced behavior. On the private Quant replay, strict matches improve 95 -> 123 of 135 and entry, exit, and PnL P90 become zero. Count parity remains unresolved (246 engine / 135 TV-window), so this PR does not claim a tier promotion.