refactor: rename sensitivity disposition paraphrase+left_as_is actions

[lipikaramaswamy]

Summary

• Rename paraphrase → suppress_inference to better reflect intent (preventing attribute inference, not preserving meaning)
• Rename left_as_is → leave_as_is for consistent action-verb form
• Add repair prompt instructions: allow overriding leave_as_is dispositions and modifying context beyond explicit entity spans to break inferential leakage

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring

Testing

• make test passes locally
• make check passes locally (format + lint + typecheck + lock-check)
• Added/updated tests for changes

Documentation

• If docs changed: make docs-build passes locally
  • internal engine changes, not user facing