Initial commit: pi-project-map skill scaffolding

- Design doc with full spec (dense markdown format, hybrid AST+LLM pipeline,
  consumption model, stale data mitigation)
- Implementation plan with 6 milestones and rollout strategy
- TypeScript package structure with all source stubs
- CLI entry point, formatter, discover, init, patch, validate, extract, merge
- Pi SKILL.md with tool definitions and format documentation

src/index.ts

@@ -0,0 +1,5 @@
+// Main entry point for pi-project-map skill
+export { initProject } from './init.js';
+export { patchFile } from './patch.js';
+export { validateMaps } from './validate.js';
+export { renderPackageMap, parsePackageMap } from './format.js';