v0.1.0 - Initial public draft

Initial public release of Structural Anchor ID Protocol (SAI).

SAI is a lightweight protocol for assigning stable structural anchor IDs to project units so that humans and AI agents can refer to the same target across sessions, refactoring, and model changes.

This release includes:

• Core README
• Protocol specification
• Reference ID generator
• Pool-and-Index model
• Example anchor files
• Paper draft / summary materials

Status: experimental public draft.