1bc0c8e6df
fluent.ts: Add public getters isCompound, compoundOperator, compoundParts to FluentRelation. Add optional CompoundState to constructor. Add CompoundPart/CompoundState interfaces. Replace 4 (this as any)._xxx property smuggles in FluentCompoundBuilder._addPart() with properly typed constructor initialization via CompoundState. fol-compiler.ts: Replace 3 (relation as any)._compoundParts / ._compoundOperator / ._isCompound duck-type reads with direct relation.compoundParts / relation.compoundOperator / relation.isCompound. extraction.ts: Replace (rel as any)._compoundParts read in getSelectorsFromAssertion with typed compoundRel.isCompound / compoundRel.compoundParts access. Eliminates 7 (as any) casts across 3 production files. Zero remaining _compoundParts/_compoundOperator/_isCompound/_originalFirstRelation smuggled references in any production source file. 598 SDK + 3 conformance + 57 E2E = 658 tests pass.