[I] Sub-epic: droolsvol2 evaluation engine — phase 2 (3+ patterns, BetaNode hierarchy, ctx.getMemory) [incubator-kie-drools]

["mdproctor (via GitHub)" <gi...@apache.org>]

mdproctor opened a new issue, #6684:
URL: https://github.com/apache/incubator-kie-drools/issues/6684

   Second phase of evaluation engine work — extends the core infrastructure (#6680) to handle multi-pattern rules, the correct BetaNode class hierarchy, and cleaner context-based memory access.
   
   ## Scope
   
   - **3+ pattern rules** — `UnitInstance.wireHead()` currently throws for `sources.size() > 2`; needs chained `JoinNode` support where each additional pattern adds one more `JoinNode` with its own `JoinMemory`
   - **BetaNode hierarchy** — introduce the intermediate class between `BetaNode` and `JoinNode`/`NotNode`/`ExistsNode`/`AccumulateNode` that carries both left and right inlets; `EvalConditionNode` stays as a `BetaNode` with left inlet only (it operates on partial tuples, which is what makes it beta — not the number of inputs)
   - **`ctx.getMemory(node)`** — implement on `AbstractContext` so inlets use `ctx.getMemory(joinNode)` rather than capturing `NodeMemories` directly; matches the original design intent found in git history
   - **`fn` on update/remove** — deferred head currently only fires on `add`; extend to `update` and `remove`
   
   ## Depends on
   
   - #6680 — Evaluation engine core infrastructure
   
   Parent epic: #6639


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