Add .d.ts type definitions for all four library modules:
- utils.d.ts: Platform detection, file ops, hook I/O, git helpers
- package-manager.d.ts: PM detection with PackageManagerName union type,
DetectionSource union, and typed config interfaces
- session-manager.d.ts: Session CRUD with Session, SessionMetadata,
SessionStats, and SessionListResult interfaces
- session-aliases.d.ts: Alias management with typed result interfaces
for set, delete, rename, and cleanup operations
These provide IDE autocomplete and type-checking for TypeScript
consumers of the npm package without converting the source to TS.
Affaan Mustafa