feat(ipuaro): add PathValidator security utility (v0.13.0)

Add centralized path validation to prevent path traversal attacks.

- PathValidator class with sync/async validation methods
- Protects against '..' and '~' traversal patterns
- Validates paths are within project root
- Refactored all 7 file tools to use PathValidator
- 51 new tests for PathValidator

packages/ipuaro/src/infrastructure/index.ts

@@ -3,3 +3,4 @@ export * from "./storage/index.js"
 export * from "./indexer/index.js"
 export * from "./llm/index.js"
 export * from "./tools/index.js"
+export * from "./security/index.js"