feat: e2e dataset benchmarks + fix npm tarball entry points (#23)

* feat: e2e dataset benchmarks, CI gate, contributor docs

- Add Docker-backed dataset E2E bench scripts, compose services, multi-run aggregates
- Add baseline compare + template JSON; wire CI job on Postgres
- Document benchmark output/regression in docs/benchmark-regression.md
- Add CONTRIBUTING, issue template + config; README updates; GIF script UX
- Typecheck scripts via tsconfig; exclude scripts from build; Prisma shim types

* fix: set rootDir to src so published tarball matches package exports

tsc was emitting dist/src/*.js while main and exports point to dist/index.js
and dist/prisma.js, breaking installs of @olegkoval/queryd on npm.

Author: oleg-koval

tsconfig.build.json

@@ -1,7 +1,8 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
-    "noEmit": false
+    "noEmit": false,
+    "rootDir": "./src"
   },
   "exclude": ["dist", "node_modules", "src/**/__tests__/**", "src/**/*.test.ts", "scripts/**"]
 }