Remove dead code files and update source tree documentation

src/sdk/index.ts

@@ -1,8 +0,0 @@
-/**
- * SDK Module Exports
- */
-
-export { buildInitPrompt, buildObservationPrompt } from './prompts.js';
-export { parseObservations, parseSummary } from './parser.js';
-export type { Observation, SDKSession } from './prompts.js';
-export type { ParsedObservation, ParsedSummary } from './parser.js';