## Why
AGNTCY alignment documentation is a Phase 1 P1 deliverable. SentryAgent.ai positions itself as AGNTCY-compliant, but there is no document explaining what AGNTCY is, how AgentIdP maps to its model, and what that means for developers and operators adopting the platform.

## What Changes
- New `docs/agntcy/` folder
- `alignment.md` — formal mapping of AgentIdP concepts to AGNTCY standard concepts
- `README.md` — entry point explaining what AGNTCY is and why it matters

## What Does Not Change
- No source code changes
- No API changes