feat(world-builder): exit validation with BFS connectivity check and atomic rollback (#10)

[Rodrigoue9]

Summary

Resolves #10 by implementing map exit edition and validation with BFS connectivity checks and atomic rollback guarantees on corrupt data.

Key Changes

• Map Exit Validation & Persistence: Validates map exits against target map bounds, obstacles, and directional connectivity.
• BFS Reachability Check: Ensures exits are reachable from walkable tiles using breadth-first search.
• Atomic Rollback: Ensures partial modifications or corrupt payloads roll back cleanly without leaving orphaned exit states.
• Automated Vitest Suite: 22 comprehensive unit and integration tests passing in �pi/src/tests/mapExitStorage.test.ts.

Closes #10

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