feat(ipuaro): add LLM integration module

- OllamaClient: ILLMClient implementation with tool support
- System prompt and context builders for project overview
- 18 tool definitions across 6 categories (read, edit, search, analysis, git, run)
- XML response parser for tool call extraction
- 98 new tests (419 total), 96.38% coverage

packages/ipuaro/src/infrastructure/index.ts

@@ -1,3 +1,4 @@
 // Infrastructure layer exports
 export * from "./storage/index.js"
 export * from "./indexer/index.js"
+export * from "./llm/index.js"