clifra v1.4.0 release

clifra 1.4.0

• Expanded Transformation Fields with conformal charts, generator subspaces, forward and inverse rollouts, and configurable rollout substeps.
• Added the sparse-constraint continuum threading research example.
• Simplified core planning, execution, and analysis APIs while removing legacy low-level helpers.
• Changed the default algebra device from CUDA to CPU.
• Renamed research/continuum_solver to research/transformation_fields.
• Refreshed documentation, geometric modeling tutorials, and benchmark artifacts.

All 876 tests passed, and all 15,882 benchmark rows completed without errors or skips. Observed performance differences remained within established rerun variability.

Full comparison: v1.3.1...v1.4.0