Per project import rules, all imports must appear at the top of the file.
The ContextAssemblyPipeline import was inside the @then step function body;
moved it to the module-level imports section alongside other production-code
imports.
ISSUES CLOSED: #10027
ACMSExecutePhaseContextAssembler previously instantiated the plain
ACMSPipeline when no pipeline was explicitly provided, missing production
Phase 1 optimizations including confidence-weighted strategy selection,
proportional budget allocation with min-budget enforcement, parallel
strategy execution with circuit breaking, and per-stage timing instrumentation.
The default is now ContextAssemblyPipeline which provides all of these
capabilities while remaining a drop-in replacement for ACMSPipeline.
ISSUES CLOSED: #10027
HAL9000