ganjihong
871070c440
refactor(cdsl_engine): extract session/extents/pattern_transform from runtime
Phase 2 of the decoupling refactor (behavior-preserving move):
- runtime_base.py: RuntimeExecutionError, FeatureExecutionError, ExtentVector
- session.py: GeometryAdapter protocol + ExecutionSession
- extents.py: end-condition planning (_extent_vectors family)
- pattern_transform.py: translate/mirror/rotate replay parameter algebra
- runtime.py: keeps executors + registry + entry points; re-exports all
moved names (incl. test-referenced privates) for import stability
No behavior change; verified against baseline (zero new failures).