- Renamed built-in extension 'Conductor' to 'Spec-Driven Development (SDD)'.
- Updated commands from '/conductor:<action>' to '/spec <action>'.
- Migrated default artifact storage from 'conductor/' to '.gemini/specs/'.
- Updated documentation, security policies, and internal references.
- Refactored FileCommandLoader to use standardized variable hydration.
- Replaced automatic Conductor deletion with a non-destructive migration prompt.
- Added step in setup to ensure .gemini/specs/ is exempted from .gitignore.