Derive zone-retest entry signals

[sybapp]

What to build

Derive long-only Zone-Retest Entry candidate signals from classified bullish LuxAlgo Liquidity Zones, using the agreed touch-plus-reclaim-close rule instead of entering directly on structure events.

A bullish zone retest occurs when an RTH bar touches a bullish FVG or bullish internal order-block zone and closes back above the zone top. Zones should only be valid during the same RTH session, should invalidate on a close below the zone bottom, and should produce at most one entry signal per zone.

Acceptance criteria

• Bullish FVG and bullish internal order-block zones can produce bullish_zone_retest_entry signal features.
• The signal is emitted only when price touches the zone and closes above the zone top.
• A zone becomes invalid after close < zone.bottom, after producing one entry, or at the end of the RTH session.
• Signal metadata links back to the source Liquidity Zone and records the zone kind.
• Tests cover touch-only rejection, reclaim acceptance, close-below invalidation, one-entry-per-zone, and no cross-session carry.

Blocked by

• Classify anonymous LuxAlgo boxes as liquidity zones #32