chore: bun init, implementation plan, model manifest

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -0,0 +1,15 @@
+# stsheets
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.3.14. [Bun](https://bun.com) is a fast all-in-one JavaScript runtime.